Perhaps you should try some spelling variations:
thuat bai » thuat bao, thuyet bai, thuat xay
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lam duc » lam duoc, pham duc, nam duoc
cua tre » cuu tre, cua triet, dua tren
duc ban » duc tan, duc van, dua ban
van lam » van nam
nang o » nang co, nang ho, nang ro
cua te » cua tu
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: ((tu sach) or (thuat bai)) ky nang o hoi. hieu van lam duc ban thanh di ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat bai)) ky nang o hoi. hieu van lam duc ban thanh di ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat bai)) ky nang o hoi. hieu van lam duc ban thanh di ((cua tre) or (cua te))*.