Perhaps you should try some spelling variations:
dua tren » dung tren
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
nam xuc » cam xuc, nam xua, nam thuc
tang xa » trang xa, tang ma, lang xa
cuu tre » cua tre, cau tren, cau treo
sac ky » sai ky
xuc va » duc va, tuc 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: thu ((sac ky) OR (cac ky)) tang xa hoi. hieu van nam xuc va thanh di ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (cac ky)) tang xa hoi. hieu van nam xuc va thanh di ((dua tren) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) OR (cac ky)) tang xa hoi. hieu van nam xuc va thanh di ((dua tren) or (cuu tre))*".