Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
dan thanh » dang thanh, danh thanh, ban thanh
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
van cam » van nam, van lam, van cau
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu 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 ((ly nang) OR (ly hang)) ((ma hoa) or (xa hoi)). hieu van cam thuc dan thanh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly hang)) ((ma hoa) OR (xa hoi)). hieu van cam thuc dan thanh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ly hang)) ((ma hoa) or (xa hoi)). hieu van cam thuc dan thanh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) OR (ly hang)) ((ma hoa) or (xa hoi)). hieu van cam thuc dan thanh hai cau treo*.