Perhaps you should try some spelling variations:
sang tao » hang tai
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
tuc va » thuc va, truc va, tuc xa
xac va » tac va, ac va, bac va
tu sac » tu sach, tu cac, tu san
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((sang tao) or (tang ma)) hoi. hieu ve cam ((xac va) or (tuc va)) hanh vi cau tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((sang tao) OR (tang ma)) hoi. hieu ve cam ((xac va) OR (tuc va)) hanh vi cau tao.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((sang tao) or (tang ma)) hoi. hieu ve cam ((xac va) or (tuc va)) hanh vi cau tao*.