Perhaps you should try some spelling variations:
sach thien » sach thieu, cach thien, sach tren
sach tien » sach tren, sach thieu
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
van lam » van nam
lam xuc » cam xuc, lam duoc
bang xa » lang xa, bang va, mang xa
cuu tre » cua tre, cau tren, cau treo
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: su ((sach thien) or (sach tien)) bang xa hoi. hieu van lam xuc va danh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thien) OR (sach tien)) bang xa hoi. hieu van lam xuc va danh vi ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su ((sach thien) or (sach tien)) bang xa hoi. hieu van lam xuc va danh vi ((dua tren) or (cuu tre))*.