Perhaps you should try some spelling variations:
chau treo » cau treo, cau theo, chau tho
dang hai » dang khai, hang hai, dung hai
danh hai » lanh hai, manh hai, danh hau
hieu van » hieu va, thien van, lieu va
lai hoi » dai hoi, lai hoa, lai roi
sach ly » sach y, sach lo, sach ty
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, mai doi
ly nang » ky nang, ly hang, ly vang
su sach » so sach, vu sach
cam tu » cam thu, nam tu, dam tu

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 (lai hoi)). hieu van cam tu va ((danh hai) or (dang hai)) chau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((mai hoi) OR (lai hoi)). hieu van cam tu va ((danh hai) OR (dang hai)) chau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ((mai hoi) OR (lai hoi)). hieu van cam tu va ((danh hai) or (dang hai)) chau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((mai hoi) OR (lai hoi)). hieu van cam tu va ((danh hai) or (dang hai)) chau treo*.