Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hieu quan » lieu quan, thien quan, lien quan
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hac duc » hoc duc, ha duc, thach duc
va hanh » van hanh, va thanh, va danh
lai cau » lai chau, lai cam, loi cau

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 xang xa hoi. ((hieu quan) or (hieu qua)) hac duc va hanh lai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. ((hieu quan) OR (hieu qua)) hac duc va hanh lai cau triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. ((hieu quan) or (hieu qua)) hac duc va hanh lai cau triet*.