Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
te sach » toc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, mang may
hieu ve » hieu va, hieu van
cau luu » cau luc
luu van » cuu van, luan van, luu hanh
hanh de » hanh ve, hanh kem
ve cau » ke cau, va cau, ve cac

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