Perhaps you should try some spelling variations:
ty thuat » ky thuat, my thuat, te thuat
thuat co » thuat do, thuat o
thuat bo » thuat bao, thuat do, thuat o
tu sach » thu sach, su sach, te sach
y thuat » ky thuat, my thuat, kxy thuat
sach ty » sach tu, sach thu, xach tay
bo chi » bao chi, ho chi, bo cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach y thuat co khi ) or ( tu sach ty thuat bo chi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach y thuat co khi ) OR ( tu sach ty thuat bo chi )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach y thuat co khi ) or ( tu sach ty thuat bo chi ))*.