Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
sach ty » sach y, sach tu, sach thu
nam xuc » cam xuc, nam xua, nam thuc
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((cac ky) or (sach ty)) nang x hoi. hieu van nam xuc va thanh di ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((cac ky) OR (sach ty)) nang x hoi. hieu van nam xuc va thanh di ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((cac ky) or (sach ty)) nang x hoi. hieu van nam xuc va thanh di ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: su ((cac ky) or (sach ty)) nang x hoi. hieu van nam xuc va thanh di ((cau tren) OR (dau tren))*.