Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
sach hoi » sach doi, sach moi, cach thoi
hoi nang » hoi lang, ho nang, hoa nang
dang hai » dang khai, hang hai, dung hai
dan khai » dang khai, van khai, dang khoi
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dan hai » doan hai, van hai, dai hai
cam tu » cam thu, nam tu, dam tu
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoi nang xa hoi. hieu va cam tu va ((((dan hai) or (dan khai))) or (dang hai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoi nang xa hoi. hieu va cam tu va ((((dan hai) OR (dan khai))) OR (dang hai)) cau treo.
• Adding a wildcard symbol may retrieve word variants: so sach hoi nang xa hoi. hieu va cam tu va ((((dan hai) or (dan khai))) or (dang hai)) cau treo*.