Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va hanh » van hanh, va thanh, va danh
xa hanh » xa thanh, xa khanh, da hanh
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
co sach » bo sach, cuon sach, hoc sach
ty nang » ky nang, ty xang, ty hang
cac tu » cac thu, cach tu, cac du
ma hoi » mai hoi, xa hoi, me hoi
lai ve » loai ve, lai va, la ve
ve cac » va cac, vien cac

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

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