Perhaps you should try some spelling variations:
thien van » thi van
khau luan » khoa luan, phap luan, pham luan
hieu van » hieu va, lieu va, hieu ve
sach van » sach han, sach va, bach van
van anh » van thanh, tuan anh, van minh
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
cuu tre » cua tre, cau tren, cau treo
anh le » manh le, oanh le, anh ve
le cuu » le cua, le huu, le cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach van ((nang xa) or (nang x)) hoi. ((hieu van) or (thien van)) khau luan van anh le cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach van ((nang xa) OR (nang x)) hoi. ((hieu van) OR (thien van)) khau luan van anh le cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach van ((nang xa) or (nang x)) hoi. ((hieu van) or (thien van)) khau luan van anh le cuu tre*.