Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
dinh thi » dinh tri
cau tren » cu tren, dau tren, ca tren
dang xa » dang xay, lang xa, dang ha
nam xuc » cam xuc, nam xua, nam thuc
va dinh » van dinh, va kinh, va tinh
cuu tre » cua tre, cau treo
y dang » ky dang, 2 dang, _ dang
xuc va » duc va, tuc va, luc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y dang xa hoi. hieu van nam xuc va dinh thi ((((cuu tre) or (cua te))) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y dang xa hoi. hieu van nam xuc va dinh thi ((((cuu tre) OR (cua te))) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: doc sach y dang xa hoi. hieu van nam xuc va dinh thi ((((cuu tre) or (cua te))) or (cau tren))*.