Perhaps you should try some spelling variations:
vao triet » va triet, mao triet, va trien
nang ma » tang ma, sang ma, nang cao
hieu va » hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach 2, sach vay
luc va » duc va, tuc va, loc va
de vao » de dao, di vao, de tao

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) or (sach y)) nang ma hoi. ((hieu va) or (lieu va)) cam luc va hanh de vao triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach y)) nang ma hoi. ((hieu va) OR (lieu va)) cam luc va hanh de vao triet.
• Adding a wildcard symbol may retrieve word variants: toc ((sach v) or (sach y)) nang ma hoi. ((hieu va) or (lieu va)) cam luc va hanh de vao triet*.