Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
lang xa » lang ha, dang xay, lang van
van hai » van ha, van chat, van hanh
hai loc » hau loc, khai luoc, hai long
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
can ky » van ky, ban ky, tan ky
dan ky » van ky
loc va » hoc va, luc va

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)) lang xa hoi. hieu van hai loc va thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (dan ky)) lang xa hoi. hieu van hai loc va thanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) or (dan ky)) lang xa hoi. hieu van hai loc va thanh hai cua tre*.