Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
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 ty ((nang ma) OR (sang ma)) hoi. ((hieu ve) or (hieu qua)) cam luc va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (sang ma)) hoi. ((hieu ve) OR (hieu qua)) cam luc va hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang ma) OR (sang ma)) hoi. ((hieu ve) or (hieu qua)) cam luc va hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) OR (sang ma)) hoi. ((hieu ve) or (hieu qua)) cam luc va hanh vi va triet*.