Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau treo » cau theo, cau tren, cau triet
van hanh » ban hanh, van anh, van ban
nam thuc » nam thuoc, am thuc, nam thu
hai cau » hai chau, hai chu, hai hau
vu sach » vu bach, su sach, vu khach
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ly nang) or (ly hang)) ma hoi. hieu va nam thuc ((van hanh) OR (van thanh)) hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ly nang) OR (ly hang)) ma hoi. hieu va nam thuc ((van hanh) OR (van thanh)) hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ly nang) or (ly hang)) ma hoi. hieu va nam thuc ((van hanh) OR (van thanh)) hai cau treo".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ly nang) or (ly hang)) ma hoi. hieu va nam thuc ((van hanh) OR (van thanh)) hai cau treo*.