Perhaps you should try some spelling variations:
van chat » cao chat
thanh ve » hanh ve, thanh va, thanh vien
luu hanh » huu han
hieu van » hieu va, thien van, lieu va
luu van » cuu van, luan van
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te 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 chat ((luu van) OR (luu hanh)) thanh ve 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 chat ((luu van) OR (luu hanh)) thanh ve 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 chat ((luu van) OR (luu hanh)) thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (nang x)) hoi. hieu van chat ((luu van) OR (luu hanh)) thanh ve cua tre*.