Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
sach thi » sach thu, sach thieu, sach tham
hanh lam » thanh lap, hanh kem, hanh va
sach tai » sach bai, sach tham, sach dao
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh ma, hanh xu
cac luc » coc luc, cac nuoc, cac cuoc
lam va » nam va, dam va, lam ha

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 thi) or (sach tai)) hanh xa hoi. hieu ve ((cac luc) OR (cau luc)) va hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach tai)) hanh xa hoi. hieu ve ((cac luc) OR (cau luc)) va hanh lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) or (sach tai)) hanh xa hoi. hieu ve ((cac luc) OR (cau luc)) va hanh lam va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach tai)) hanh xa hoi. hieu ve ((cac luc) OR (cau luc)) va hanh lam va triet*.