Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
so sanh » do sanh
sanh va » hanh va, anh va, sinh va
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
di cua » dai cua, doi cua, de cua
cua te » cua tu

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 va ((nang ma) or (tang ma)) hoi. hieu van cam tuc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh va ((nang ma) OR (tang ma)) hoi. hieu van cam tuc van hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: so sanh va ((nang ma) or (tang ma)) hoi. hieu van cam tuc van hanh di cua te*.