Perhaps you should try some spelling variations:
tinh viet » trinh viet, ninh viet, dinh viet
hieu van » hieu va, thien van, lieu va
cham duc » pham duc, pham duy, phan duc
te sach » toc sach
va tinh » may tinh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, nang cao
tu nang » tru nang, tu nong, tu nano
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: te sach tu nang ma hoi. hieu van ((cham duc) OR (cham soc)) va tinh viet ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang ma hoi. hieu van ((cham duc) OR (cham soc)) va tinh viet ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang ma hoi. hieu van ((cham duc) OR (cham soc)) va tinh viet ((cua tre) or (cuu tre))*.