Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
kho tang » cao tang
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
xa danh » va danh, dia danh, nam danh
cac tac » cac toc, cac bac, cac dac
van cac » van hac, van cau, van bac
ky tang » ky nang, ky dang, ky trong
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
tac xa » tuc xa, tac da

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 ((ky tang) OR (kho tang)) ma hoi. hieu van cac tac xa danh doi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) ma hoi. hieu van cac tac xa danh doi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (kho tang)) ma hoi. hieu van cac tac xa danh doi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (kho tang)) ma hoi. hieu van cac tac xa danh doi ((cua tre) or (cuu tre))*.