Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
dang xay » dang van, van xay
hai loc » hau loc, khai luoc, hai long
van hai » van ha, van chat, van hanh
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, cay phoi
can ky » van ky, ban ky, tan ky
dan ky » van ky
loc va » hoc va, luc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((can ky) or (dan ky)) dang xay hoi. hieu van hai loc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (dan ky)) dang xay hoi. hieu van hai loc va thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) or (dan ky)) dang xay hoi. hieu van hai loc va thanh vi cua tre*.