Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
te sach » toc sach
va tinh » may tinh
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang ma hoi. hieu ve cac tuc ((va thanh) OR (va tinh)) hai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ma hoi. hieu ve cac tuc ((va thanh) OR (va tinh)) hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ma hoi. hieu ve cac tuc ((va thanh) OR (va tinh)) hai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ma hoi. hieu ve cac tuc ((va thanh) OR (va tinh)) hai ((cua tre) or (cua te))*.