Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
danh hai » dang hai, lanh hai, manh hai
dan danh » van danh, han danh, ban danh
thuc dan » thuc hanh, hoc dan, thuc vat
van lam » van nam
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu sach
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
van am » van nam, van dam, van ai

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) OR (ly hang)) xa hoi. hieu ((van am) or (van lam)) thuc dan danh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly hang)) xa hoi. hieu ((van am) OR (van lam)) thuc dan danh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ly hang)) xa hoi. hieu ((van am) or (van lam)) thuc dan danh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) OR (ly hang)) xa hoi. hieu ((van am) or (van lam)) thuc dan danh hai cau treo*.