Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh la » hanh lam, hanh va, hanh ma
xa hanh » xa thanh, xa khanh, va hanh
cach tu » cach thuc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
bo sach » co sach, hoc sach
nang ma » tang ma, sang ma, mang may
cac tu » cac thu, cac du, tac tu
la ve » ly ve, ca ve, va 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 ty ((nang ma) or (nang cao)) hoi. hieu ve ((cac tu) OR (cach tu)) xa hanh la ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty ((nang ma) OR (nang cao)) hoi. hieu ve ((cac tu) OR (cach tu)) xa hanh la ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty ((nang ma) or (nang cao)) hoi. hieu ve ((cac tu) OR (cach tu)) xa hanh la ve triet".
• Adding a wildcard symbol may retrieve word variants: bo sach ty ((nang ma) or (nang cao)) hoi. hieu ve ((cac tu) OR (cach tu)) xa hanh la ve triet*.