Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tang van » dang van, hoang van, trong van
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
tac van » tac vang, cac van, tac va
cac tac » cac toc, cac bac, cac dac
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky tang van hoi. ((hieu ve) or (lieu va)) cac tac van hanh di ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang van hoi. ((hieu ve) OR (lieu va)) cac tac van hanh di ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang van hoi. ((hieu ve) or (lieu va)) cac tac van hanh di ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang van hoi. ((hieu ve) or (lieu va)) cac tac van hanh di ((cua tre) OR (cuu tre))*.