Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
vat hanh » vat thanh, van hanh, va hanh
hieu he » hieu ve, hiem he, hieu le
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
vi cua » vai cua, di 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: vu sac ky ((mang may) or (nang x)) hoi. hieu he ((nam thuc) OR (nam thuoc)) vat hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((mang may) OR (nang x)) hoi. hieu he ((nam thuc) OR (nam thuoc)) vat hanh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky ((mang may) or (nang x)) hoi. hieu he ((nam thuc) OR (nam thuoc)) vat hanh vi cua te*".