Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
te sach » toc sach
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
ve cam » ve cham, ve cac, va cam
di cuu » di cau, dinh cuu
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (so sanh)) ky nang xa hoi. hieu ve cam thuc va hang ((di cuu) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sanh)) ky nang xa hoi. hieu ve cam thuc va hang ((di cuu) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (so sanh)) ky nang xa hoi. hieu ve cam thuc va hang ((di cuu) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ky nang xa hoi. hieu ve cam thuc va hang ((di cuu) OR (di cua)) tre*.