Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
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 nang xa hoi. hieu van cau ((truc va) or (thuc day)) ((thanh hai) OR (thanh san)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van cau ((truc va) OR (thuc day)) ((thanh hai) OR (thanh san)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu van cau ((truc va) or (thuc day)) ((thanh hai) OR (thanh san)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu van cau ((truc va) or (thuc day)) ((thanh hai) OR (thanh san)) cuu tre*.