Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
cac tuc » cac toc, cac tu, cac nuoc
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac bac, cac dac
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 xa hoi. hieu ve ((cac tuc) OR (cac tac)) va thanh san ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xa hoi. hieu ve ((cac tuc) OR (cac tac)) va thanh san ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xa hoi. hieu ve ((cac tuc) OR (cac tac)) va thanh san ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xa hoi. hieu ve ((cac tuc) OR (cac tac)) va thanh san ((cua tre) or (cua te))*.