Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
doi cua » dai cua, hoi cua
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
di cua » dai cua, de cua, do cua
sac ky » sai ky
ho hoi » hoc hoi, hoa hoi, hoi hoi
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: su ((sac ky) or (cac ky)) nang ho hoi. hieu ve nam thuc van hanh ((di cua) OR (doi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (cac ky)) nang ho hoi. hieu ve nam thuc van hanh ((di cua) OR (doi cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (cac ky)) nang ho hoi. hieu ve nam thuc van hanh ((di cua) OR (doi cua)) triet*".