Perhaps you should try some spelling variations:
mao triet » tao thiet, va triet, bo triet
toc sach » hoc sach, doc sach, thuoc sach
sang ma » tang ma, nang ma, sang tao
hieu va » hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va, loc va
di mao » di vao, di ma, dien mao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v ((nang cao) or (sang ma)) hoi. ((hieu va) or (lieu va)) cam luc va hanh di mao triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v ((nang cao) OR (sang ma)) hoi. ((hieu va) OR (lieu va)) cam luc va hanh di mao triet.
• Adding a wildcard symbol may retrieve word variants: toc sach v ((nang cao) or (sang ma)) hoi. ((hieu va) or (lieu va)) cam luc va hanh di mao triet*.