Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tai » thanh tai, hang tai, han tai
qua tham » qua cham, qua than, qua thanh
tham lao » pham lao, tham khao, tham lang
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
di hoi » dai hoi, doi hoi, bi hoi
lao va » tao va, cao va, bao va
du hoi » du hoc, lu hoi, du hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang ((du hoi) OR (di hoi)). hieu qua tham lao va hanh tai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang ((du hoi) OR (di hoi)). hieu qua tham lao va hanh tai ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang ((du hoi) OR (di hoi)). hieu qua tham lao va hanh tai ((cua triet) or (va triet))*".