Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
doan van » doan va, hoang van, luan van
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
tuc vay » tu vay, tuc xay, thuc vat
van cuu » van cau, van chu, van cu
cuu tre » cua tre, cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky dang xa hoi. ((hieu van) OR (lieu va)) cac ((tuc vay) or (tuc va)) doan van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xa hoi. ((hieu van) OR (lieu va)) cac ((tuc vay) OR (tuc va)) doan van cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky dang xa hoi. ((hieu van) OR (lieu va)) cac ((tuc vay) or (tuc va)) doan van cuu tre*".