Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
dinh vai » dinh van, dinh vi, dinh va
sach ky » sach y, sach ty, sach kem
dang xa » dang xay, lang xa, dang ha
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
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 van) or (thien van)) giao duc va dinh 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 van) OR (thien van)) giao duc va dinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) dang xa hoi. ((hieu van) or (thien van)) giao duc va dinh vai cua tre*.