Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dau nuoc » dat nuoc, dau ngoc, cap nuoc
dinh thi » dinh tri
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
van dau » van dao, phan dau
dan thi » dang thi, tran thi, dan thuc
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
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 sac ky dang xa hoi. hieu van dau nuoc va ((dan thi) or (dinh thi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xa hoi. hieu van dau nuoc va ((dan thi) OR (dinh thi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xa hoi. hieu van dau nuoc va ((dan thi) or (dinh thi)) cuu tre*.