Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
vai va » mai va, dai va, hai va
sac ky » cac ky
ve nam » he nam, va nam, le nam
vu va » vu van, tu va, su va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sai ky)) dang xa hoi. hieu ve nam thuc ban hanh ((vu va) or (vai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) dang xa hoi. hieu ve nam thuc ban hanh ((vu va) OR (vai va)) triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) dang xa hoi. hieu ve nam thuc ban hanh ((vu va) or (vai va)) triet*.