Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
thanh lap » thanh san, phan lap, thanh hai
hanh lai » hanh lam, hanh tai, thanh loi
hieu van » hieu va, thien van, lieu va
hac duc » hoc duc, ha duc, thach duc
sach ty » sach y, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
van hac » van hoc, van ha, van hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu van hac duc va ((hanh lai) or (thanh lap)) chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu van hac duc va ((hanh lai) OR (thanh lap)) chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang xa hoi. hieu van hac duc va ((hanh lai) or (thanh lap)) chau triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu van hac duc va ((hanh lai) or (thanh lap)) chau triet*.