Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
dong doi » duong doi, dung doi, dong hoi
cua tre » cua te, cuu tre, cua triet
xa dong » ha dong, van dong, lao dong
bo sach » co sach, hoc sach
sach tu » sach thu, cach tu, sach ty
cam tuc » cam xuc, cam tu, dam thuc
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano

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 tu nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa dong doi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach tu nang xa hoi. hieu van ((cam tuc) OR (nam thuc)) xa dong doi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: bo sach tu nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa dong doi ((cua tre) or (cau tren))*.