Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
cau treo » cau theo, cau tren, cau triet
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
hai cau » hai chau, hai chu, hai hau

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 dao) or (lanh dao)) nang x ho. hieu van cam duc ((van hanh) OR (ban hanh)) hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach dao) OR (lanh dao)) nang x ho. hieu van cam duc ((van hanh) OR (ban hanh)) hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach dao) or (lanh dao)) nang x ho. hieu van cam duc ((van hanh) OR (ban hanh)) hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su ((sach dao) or (lanh dao)) nang x ho. hieu van cam duc ((van hanh) OR (ban hanh)) hai cau treo*.