Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
thu sach » thuat sach, thuoc sach, thu hoach
tuc van » thuc van, truc van, duc van
tu sach » su sach, te sach, tu cach
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
van cau » van dau, van hau, van chat
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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) or (thu sach)) ky tang xa hoi. hieu van cau ((tuc van) or (tuc va)) thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang xa hoi. hieu van cau ((tuc van) OR (tuc va)) thanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky tang xa hoi. hieu van cau ((tuc van) or (tuc va)) thanh di cua viet*.