Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
su sach » so sach
lam tuc » lam thuoc, lam truoc, luat tuc
dinh ve » dinh ket, dinh van
xa dinh » xac dinh, va dinh, ba dinh
van lam » van nam
bang xa » lang xa, bang va, mang xa
vu sach » vu bach, vu khach
cuu tre » cua tre, cau tren, cau treo

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) or (vu sach)) khien bang xa hoi. hieu van lam tuc xa dinh ve ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) khien bang xa hoi. hieu van lam tuc xa dinh ve ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) khien bang xa hoi. hieu van lam tuc xa dinh ve ((dua tren) or (cuu tre))*.