Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va trien » va truyen, va thiet, va tuyen
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
van cac » van hac, van cau, van bac
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. hieu van cac xuc ((va hanh) or (ban hanh)) vi ((cua triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu van cac xuc ((va hanh) OR (ban hanh)) vi ((cua triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu van cac xuc ((va hanh) or (ban hanh)) vi ((cua triet) or (va trien))*.