Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hang doi » hang di, hang loi, huong doi
cam thuc » am thuc, nam thuc, cam thu
doi cau » doi dau, di cau, doi ca
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
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
so sanh » do sanh
ve cam » ve cham, ve cac, va cam
ha hoi » hoa hoi, ha noi, xa hoi

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 tang) or (ky dang)) ha hoi. hieu ve cam thuc va hang doi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sanh)) ((ky tang) OR (ky dang)) ha hoi. hieu ve cam thuc va hang doi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ((ky tang) or (ky dang)) ha hoi. hieu ve cam thuc va hang doi cau tren*.