Perhaps you should try some spelling variations:
thien van » thi van
hoc sach » hoc sinh, hoc cac, hoc anh
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hac thuc » hoc thuc, ha thuc, thach thuc
bo sach » co sach
cuu tre » cua tre, cau tren, cau treo
thuc va » thuc vat, thuc dan, thuc day
van hac » van hoc, van ha, van hai
lo nang » ho nang, ly nang, loai nang
ca tren » cau tren, cu tren, la tren
nang o » nang co, nang ho, nang ro
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: ((bo sach) or (hoc sach)) lo nang o hoi. thien van hac thuc va thanh vi ((cuu tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (hoc sach)) lo nang o hoi. thien van hac thuc va thanh vi ((cuu tre) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (hoc sach)) lo nang o hoi. thien van hac thuc va thanh vi ((cuu tre) or (ca tren))*.