Perhaps you should try some spelling variations:
vao triet » va triet, mao triet, va trien
sach ya » sach xa, sach ha, sach va
nang ma » tang ma, sang ma, nang cao
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
hieu va » hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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