Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cam thuc » am thuc, nam thuc, cam thu
lanh hai » manh hai, thanh hai, lang chai
danh hai » dang hai, manh hai, danh hau
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
van cam » van nam, van lam, van cau

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 ly nang ((mai hoi) or (xa hoi)). hieu van cam thuc va ((danh hai) or (lanh hai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((mai hoi) OR (xa hoi)). hieu van cam thuc va ((danh hai) OR (lanh hai)) cau treo.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((mai hoi) or (xa hoi)). hieu van cam thuc va ((danh hai) or (lanh hai)) cau treo*.