Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
dau tren » dau tien, dat tren, dau tieng
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
hieu ve » hieu va, hieu van
vai dau » va dau, van dau, xvii dau
tu van » tu va
ve nam » he nam, va nam, le nam

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 nam thuc van 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 nam thuc van hanh vai dau tren.
• Adding a wildcard symbol may retrieve word variants: tu van ky ((sang ma) or (nang ma)) hoi. hieu ve nam thuc van hanh vai dau tren*.