Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
ly hang » ly quang
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
ly nang » ky nang, ly vang, ly quang
hai cau » hai chau, hai chu, hai hau
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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

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