Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thanh vi » hanh vi, thanh va, thanh ve
ha thanh » va thanh, pham thanh, phan thanh
sach ty » sach tu, sach thu, xach tay
cac tac » cac toc, cac bac, cac dac
hieu ve » hieu va, hieu van
ro hoi » co hoi, mo hoi, ro doi
ve cac » va cac, vien cac
tac ha » bac ha, tac da, tac xa
vi ve » va ve, gi ve, ve ve
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach y)) nang ((ro hoi) OR (o hoi)). hieu ve cac tac ha thanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ((ro hoi) OR (o hoi)). hieu ve cac tac ha thanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang ((ro hoi) OR (o hoi)). hieu ve cac tac ha thanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang ((ro hoi) OR (o hoi)). hieu ve cac tac ha thanh vi ve triet*.