Perhaps you should try some spelling variations:
thien van » thi van
tinh vai » tinh va, tinh hai, tinh bai
vai cua » dai cua, hai cua, lai cua
duc may » duc mau, duc man, duc manh
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) dang xa hoi. ((hieu ve) or (thien van)) giao duc may tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) dang xa hoi. ((hieu ve) OR (thien van)) giao duc may tinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) dang xa hoi. ((hieu ve) or (thien van)) giao duc may tinh vai cua tre*.