Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, dua tren
ma hoi » mai hoi, xa hoi, ma hoa

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: toc sach ky nang ma hoi. ((hieu ve) OR (hieu va)) cac duc va thanh van ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ma hoi. ((hieu ve) OR (hieu va)) cac duc va thanh van ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ma hoi. ((hieu ve) OR (hieu va)) cac duc va thanh van ((cua tre) or (cua triet))*.