Perhaps you should try some spelling variations:
chau treo » cau treo, cau theo, chau tho
hai chau » lai chau, ha chau, hat chau
dang hai » dang khai, hang hai, dung hai
nang mai » nang ma, lang mai, nang cai
cam thuc » am thuc, nam thuc, cam thu
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, lieu va
va dang » van dang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
su sach » vu sach
so sach » so sanh, bo sach, co sach

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

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