Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
su sach » vu sach
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
hieu va » lieu va
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ly nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ly nang ma hoi. ((hieu va) OR (hieu qua)) cam tuc va hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ly nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va hanh vi va triet*.