Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thien van » thi van
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
lam duc » lam duoc, pham duc, nam duoc
luu tre » luu tru, cuu tre, luy tre
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
vi luu » vi lua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((y nang) OR (v nang)) o hoi. ((lieu va) or (thien van)) lam duc va doan vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (v nang)) o hoi. ((lieu va) OR (thien van)) lam duc va doan vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) OR (v nang)) o hoi. ((lieu va) or (thien van)) lam duc va doan vi luu tre*".