Perhaps you should try some spelling variations:
"te sach ki thuat do thi" » "te sach ky thuat do thi", "toc sach ki thuat do thi", "te sach kinh thuat do thi", "te sach bai thuat do thi", "te sach kem thuat do thi"
"tu sach ty thuat bo khi" » "tu sach ky thuat bo khi", "tu sach my thuat bo khi", "tu sach te thuat bo khi", "tu sach ty thuat bao khi", "tu sach ty thuat co khi", "tu sach ty thuat so khi", "thu sach ty thuat bo khi", "su sach ty thuat bo khi", "tu cach ty thuat bo khi", "tu sach y thuat bo khi", "tu sach thu thuat bo khi", "tu xach tay thuat bo khi", "tu sach ty thuat bo chi", "tu sach ty thuat bo thi", "tu sach ty thuat bco khi"
"tu sach tu thuat o khi" » "tu sach thu thuat o khi", "tu sach te thuat o khi", "tu sach tu thua o khi", "thu sach tu thuat o khi", "su sach tu thuat o khi", "tu cach tu thuat o khi", "tu sach uu thuat o khi", "tu sach tu thuat co khi"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("te sach ki thuat do thi") or ((("tu sach ty thuat bo khi") or ("tu sach tu thuat o khi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach ki thuat do thi") OR ((("tu sach ty thuat bo khi") OR ("tu sach tu thuat o khi")))).
• Removing quotes may allow a broader search: (( te sach ki thuat do thi ) or ((( tu sach ty thuat bo khi ) or ( tu sach tu thuat o khi )))).
• Adding a wildcard symbol may retrieve word variants: (("te sach ki thuat do thi") or ((("tu sach ty thuat bo khi") or ("tu sach tu thuat o khi"))))*.