Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
hanh ve » hanh vi, hanh va, hanh kem
luu van » cuu van, luan van, luu hanh
cau luu » cau luc
hieu va » lieu va, hieu qua
te sach » toc sach
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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 (nang ma)) hoi. ((hieu ve) OR (hieu va)) cau luu van 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 ve) OR (hieu va)) cau luu van 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 ve) OR (hieu va)) cau luu van hanh ve ve triet*".