Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ve triet » va trien, su triet
thanh ve » hanh ve, thanh va, thanh vien
luu van » cuu van, luan van, luu hanh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
ve cac » va cac, vien cac
ve cau » ke cau, va cau, le cau
ve ve » de ve, va ve, ke ve

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 (sang ma)) hoi. hieu ((ve cau) OR (ve cac)) luu van thanh ve ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (sang ma)) hoi. hieu ((ve cau) OR (ve cac)) luu van thanh ve ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (sang ma)) hoi. hieu ((ve cau) OR (ve cac)) luu van thanh ve ve triet*".