Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
doan van » doan va, hoang van, luan van
luoc van » luoc can, luoc va, luc van
tu sach » thu sach, su sach, te sach
van cuu » van cau, van chu, van cu
luc vay » luc va, luc van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
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 sach)) y nang o hoi. hieu ve cham ((luc vay) or (luoc van)) doan van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) y nang o hoi. hieu ve cham ((luc vay) OR (luoc van)) doan van cuu tre*.