Perhaps you should try some spelling variations:
hieu luat » hieu qua
hanh lai » hanh lam, hanh tai, thanh lap
hieu vuc » hieu luc, hieu tuc, hieu thuc
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach 2, sach vay
luc va » duc va, tuc va, loc va
lai ca » lai cua, lai cam, loai ca

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 v) OR (sach y)) nang ma hoi. ((hieu vuc) or (hieu luat)) nang luc va hanh lai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) nang ma hoi. ((hieu vuc) OR (hieu luat)) nang luc va hanh lai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) OR (sach y)) nang ma hoi. ((hieu vuc) or (hieu luat)) nang luc va hanh lai ca viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) OR (sach y)) nang ma hoi. ((hieu vuc) or (hieu luat)) nang luc va hanh lai ca viet*.