Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
va triet » va thiet, va trien, ve triet
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
su sach » so sach
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
vu sach » vu bach, vu khach
qua cau » quan cau, qua cac, qua ca
luc va » duc va, tuc va, loc va

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

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