Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van nhanh » van hanh, van khanh, van nhan
cau treo » cau theo, cau tren, cau triet
van nang » van quang, van ban, van dong
hieu van » hieu va, thien van, lieu va
sach ly » sach y, sach lo, sach hay
sach ty » sach y, sach tu, sach thu
hai cau » hai chau, hai chu, hai hau
x hoi » xa hoi, o hoi, x ho

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

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