Perhaps you should try some spelling variations:
thien van » thi van
sach van » sach va, bach van, cach van
sach han » sach tham, sach danh, sach nang
hieu van » hieu va, lieu va, hieu ve
hau luan » khau luan, thau luan, dau luan
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hanh le » thanh le, hanh ve, hanh de
cua tre » cua te, cuu tre, cua triet
le cua » ly cua

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) OR (sach han)) nang xa hoi. ((hieu van) or (thien van)) hau luan van hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach van) OR (sach han)) nang xa hoi. ((hieu van) OR (thien van)) hau luan van hanh le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach van) OR (sach han)) nang xa hoi. ((hieu van) or (thien van)) hau luan van hanh le cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach van) OR (sach han)) nang xa hoi. ((hieu van) or (thien van)) hau luan van hanh le cua tre*.