Perhaps you should try some spelling variations:
khau luan » khoa luan, phap luan, pham luan
dau luan » dan luan, dat luan, dau quang
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
hanh le » thanh le, hanh ve, hanh de
cuu tre » cua tre, cau tren, cau treo
sach va » sach xa, sach ha, sach dao
dau luc » cau luc, dau nuoc, dau luot
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
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 va nang xa hoi. hieu van ((dau luc) or (((dau luan) OR (khau luan)))) van hanh le cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach va nang xa hoi. hieu van ((dau luc) OR (((dau luan) OR (khau luan)))) van hanh le cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach va nang xa hoi. hieu van ((dau luc) or (((dau luan) OR (khau luan)))) van hanh le cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach va nang xa hoi. hieu van ((dau luc) or (((dau luan) OR (khau luan)))) van hanh le cuu tre*.