Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cam thuc » am thuc, nam thuc, cam thu
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
te sach » toc sach
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) or (do sanh)))) ky lang xa hoi. hieu ve cam thuc va hang di cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (((so sanh) OR (do sanh)))) ky lang xa hoi. hieu ve cam thuc va hang di cau triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((so sanh) or (do sanh)))) ky lang xa hoi. hieu ve cam thuc va hang di cau triet*.