Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
van hang » van khang, van hoang, van thang
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hang di » hang doi, hang vi, hang dien
ve cam » ve cham, ve cac, va cam
di cau » da cau, diem cau

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 van hang di cau tren~.
• 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 van hang di cau tren.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ky nang xa hoi. hieu ve cam thuc van hang di cau tren*.