Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu le » hieu ve, hieu he, hieu ly
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
cua tu » cua tuc, cua su, cua cu

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 le nam thuc va hanh vi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((mang may) OR (nang x)) hoi. hieu le nam thuc va hanh vi ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky ((mang may) or (nang x)) hoi. hieu le nam thuc va hanh vi ((cua te) OR (cua tu))*".