Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
tuyen » truyen, quyen

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) or (thu hoach)) ky tang xa hoi. hieu va cac xuc va hanh vi ((va trien) or (ke tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky tang xa hoi. hieu va cac xuc va hanh vi ((va trien) OR (ke tuyen)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky tang xa hoi. hieu va cac xuc va hanh vi ((va trien) or (ke tuyen))*.