Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hanh vai » hanh vi, hanh va, hanh tai
sang ma » tang ma, sang tao, mang may
vai dau » va dau, van dau, xvii dau
nang ma » tang ma, nang cao, mang may
hieu ve » hieu va, hieu van
tu van » tu va
tuc va » thuc va, truc va, duc va
ve cam » ve cham, ve cac, va cam

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

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