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
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu he » hieu ve, hiem he, hieu le
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
he nam » ha nam, nghe nam
vai va » mai va, dai va, hai va
vi va » vi van, vu va, bi 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 dang xa hoi. hieu he nam thuc van hanh ((vi va) or (vai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xa hoi. hieu he nam thuc van hanh ((vi va) OR (vai va)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xa hoi. hieu he nam thuc van hanh ((vi va) or (vai va)) triet*.