Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh hai » tinh thai, tinh chat, trinh han
tinh lai » tinh lao, minh lai, tinh bai
hieu van » hieu va, thien van, lieu va
chau tre » chay tren, chau tho, cho tre
ty dong » tay dong, tu dong, ly dong
cam tuc » cam xuc, cam tu, nam thuc
ty nong » tu nong, may nong, duy nong
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty nong) or (ty dong)) xa hoi. hieu van cam tuc va ((tinh lai) OR (tinh hai)) chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nong) OR (ty dong)) xa hoi. hieu van cam tuc va ((tinh lai) OR (tinh hai)) chau tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nong) or (ty dong)) xa hoi. hieu van cam tuc va ((tinh lai) OR (tinh hai)) chau tre*".