Perhaps you should try some spelling variations:
trong van » trong cac
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
hieu van » thien van, lieu va, hieu ve
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
lang xa » lang ha, dang xay, lang van
vai cua » dai cua, hai cua, lai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((lang xa) or (trong van)) hoi. ((hieu van) or (hieu va)) cam duc va hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((lang xa) OR (trong van)) hoi. ((hieu van) OR (hieu va)) cam duc va hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang xa) or (trong van)) hoi. ((hieu van) or (hieu va)) cam duc va hanh vai cua viet*.