Perhaps you should try some spelling variations:
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
cam tuc » cam tu, nam thuc, dam thuc
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa
sinh y » sinh ly
sanh y » anh y, hanh y, sach y
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sanh y) or (sinh y)) nang ma hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sanh y) OR (sinh y)) nang ma hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sanh y) or (sinh y)) nang ma hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi ca viet".
• Adding a wildcard symbol may retrieve word variants: so ((sanh y) or (sinh y)) nang ma hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi ca viet*.