Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hai chau » lai chau, ha chau, hat chau
van dang » van dong, van dung, van nang
truc van » truc va, thuc van, truc ban
hai cau » hai chu, hai hau, hoi cau
su sach » so sach, vu sach
sach lo » sach dao, sach doi, sach hoi
nang ma » tang ma, sang ma, mang may
van cau » van dau, van hau, van chat

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 lo ((nang ma) or (nang cao)) hoi. hieu van cau truc van dang ((hai cau) OR (hai chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach lo ((nang ma) OR (nang cao)) hoi. hieu van cau truc van dang ((hai cau) OR (hai chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach lo ((nang ma) or (nang cao)) hoi. hieu van cau truc van dang ((hai cau) OR (hai chau)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach lo ((nang ma) or (nang cao)) hoi. hieu van cau truc van dang ((hai cau) OR (hai chau)) treo*.