Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
su sach » so sach, vu sach
hac tuc » thac toc, thai tuc
tai cuu » tai cuc, tai buu, tai cua
va hang » va nang, va lang, va hanh
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
va hac » van hac, va khac, va cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang x)) hoi. hieu va hac tuc ((va hang) OR (van hang)) tai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (nang x)) hoi. hieu va hac tuc ((va hang) OR (van hang)) tai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang x)) hoi. hieu va hac tuc ((va hang) OR (van hang)) tai cuu tre*.