Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh lai » hanh lam, hanh tai, thanh lap
xa hanh » xa thanh, xa khanh, va hanh
sach tu » sach thu, cach tu, sach ty
bo sach » co sach, hoc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
ma hoi » mai hoi, xa hoi, ma hoa
cac tu » cac thu, cach tu, tac tu
lai ve » loai ve, lai va, la ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach tu nang ma hoi. ((hieu ve) or (hieu qua)) ((cac tu) or (cac du)) xa hanh lai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach tu nang ma hoi. ((hieu ve) OR (hieu qua)) ((cac tu) OR (cac du)) xa hanh lai ve triet.
• Adding a wildcard symbol may retrieve word variants: bo sach tu nang ma hoi. ((hieu ve) or (hieu qua)) ((cac tu) or (cac du)) xa hanh lai ve triet*.