Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
hien thuan » thien thuat
kxy thuat » ki thuat, my thuat, ky thua
lanh kxy » hanh ky, lanh lay
thuat do » thuat o
tu sach » thu sach, su sach, te sach
do khi » doi khi, do thi, 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: (( tu sach ((ky thuat) or (hien thuan)) do khi ) or ( thuat lanh kxy thuat do khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ((ky thuat) OR (hien thuan)) do khi ) OR ( thuat lanh kxy thuat do khi )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ((ky thuat) or (hien thuan)) do khi ) or ( thuat lanh kxy thuat do khi ))*.