Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
ly nang » ky nang, ly hang, ly vang
da vai » da tai, da voi, va vai
ve cam » ve cham, ve cac, va cam
da va » dia va, do va, ca va

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 vai) OR (da va)) cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ly nang) or (ty xang)) xa hoi. hieu ve cam thuc vat ((da vai) OR (da va)) 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 vai) OR (da va)) cau treo*.