Perhaps you should try some spelling variations:
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
va triet » va trien, ve triet, cua triet
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
qua cau » quan cau, qua cac, qua ca
ma hoi » xa hoi, ma hoa, me hoi
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly nang ((ma hoi) OR (mai hoi)). hieu qua cau truc van hanh vi ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang ((ma hoi) OR (mai hoi)). hieu qua cau truc van hanh vi ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang ((ma hoi) OR (mai hoi)). hieu qua cau truc van hanh vi ((va triet) or (va thiet))*".