Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tan hanh » tan thanh, tang hanh, toan hanh
hanh lam » thanh lap, hanh kem, hanh va
te sach » toc sach
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu nang xa hoi. hieu van pham duc tan hanh lam ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. hieu van pham duc tan hanh lam ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. hieu van pham duc tan hanh lam ((cua tre) or (cua te))*.