Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
ty hang » ty xang, thi hang, thu hang
ly hang » ly quang
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
lam va » nam va, dam va, lam ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty hang) or (ly hang)) xa hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly hang)) xa hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) or (ly hang)) xa hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ly hang)) xa hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va triet*.