Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
thanh de » hanh de, thanh ve, thanh do
tuoc gia » quoc gia, toc gia, luoc gia
bac tuoc » bach tuoc, tac thuoc, bac hoc
cuu tre » cua tre, cau treo
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
so sanh » do sanh
van bac » van ban, van bao, van hac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sanh)) vu nang xa hoi. thien van bac tuoc gia thanh de ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) vu nang xa hoi. thien van bac tuoc gia thanh de ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) vu nang xa hoi. thien van bac tuoc gia thanh de ((cuu tre) or (cau tren))*.