Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
nam xua » nam cua, nam mua, nam qua
xua ban » xuat ban, cua ban, qua ban
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
anh vi » hanh vi, anh va, anh vu
anh ve » hanh ve, anh va, anh viet

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 nam xua ban ((anh vi) OR (anh ve)) ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van nam xua ban ((anh vi) OR (anh ve)) ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu van nam xua ban ((anh vi) OR (anh ve)) ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu van nam xua ban ((anh vi) OR (anh ve)) ((dua tren) or (cuu tre))*.