Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thanh ve » thanh va, thanh vien, thanh van
hanh ve » hanh vi, hanh va, hanh kem
luu van » cuu van, luan van, luu hanh
cau luu » cau luc
te sach » toc sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va cau » van cau, va cac, va dau

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