Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, lieu va, hieu ve
te sach » toc sach
hanh le » thanh le, hanh ve, hanh de
luu van » cuu van, luan van, luu hanh
hau luu » hat luu, phap luu
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
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 y ((nang xa) or (nang x)) hoi. ((hieu van) OR (thien van)) hau luu van hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (nang x)) hoi. ((hieu van) OR (thien van)) hau luu van hanh le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (nang x)) hoi. ((hieu van) OR (thien van)) hau luu van hanh le cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (nang x)) hoi. ((hieu van) OR (thien van)) hau luu van hanh le cua tre*.