Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh ki » hanh vi, hanh ky, hanh kien
luc van » luoc van, luu van, duc van
vuc van » duc van, thuc van, chuc van
sach va » sach xa, sach ha, sach dao
tu sach » thu sach, su sach, te sach
lai hoi » dai hoi, lai hoa, lai roi
va dang » van dang, va nang, va lang
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
ki ve » ke ve, gi ve, vi ve

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 va dang ((ma hoi) or (lai hoi)). hieu va cac ((vuc van) or (luc van)) hanh ki ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va dang ((ma hoi) OR (lai hoi)). hieu va cac ((vuc van) OR (luc van)) hanh ki ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach va dang ((ma hoi) or (lai hoi)). hieu va cac ((vuc van) or (luc van)) hanh ki ve triet*.