Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, mang xa
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
vi ve » va ve, gi ve, ve ve

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 (su sach)) ty ((nang xa) or (nang ma)) hoi. hieu va cam luc va hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty ((nang xa) OR (nang ma)) hoi. hieu va cam luc va hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty ((nang xa) or (nang ma)) hoi. hieu va cam luc va hanh vi ve triet*.