Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
cau treo » cau theo, cau tren, cau triet
so sach » so sanh, bo sach, co sach
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
van cau » van dau, van hau, van chat
ve cam » ve cham, ve cac, va cam
vat da » vat va, vat de
da van » dao van, dam van, va van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ly nang) OR (ty xang)) xa hoi. hieu ve cam thuc vat da van cau treo~.
• Adding a wildcard symbol may retrieve word variants: so sach ((ly nang) or (ty xang)) xa hoi. hieu ve cam thuc vat da van cau treo*.