Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
va triet » va thiet, va trien, ve triet
thanh di » thanh doi, thanh de, thanh do
ha thanh » va thanh, pham thanh, phan thanh
ly quang » le quang, vu quang
su sach » so sach, vu sach
thuc ha » thu ha, thuc va, thuc hanh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
ty hang » ly hang, ty xang, thi hang

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 quang)) xa hoi. hieu ve pham thuc ha thanh di ((va triet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly quang)) xa hoi. hieu ve pham thuc ha thanh di ((va triet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ly quang)) xa hoi. hieu ve pham thuc ha thanh di ((va triet) or (cua vat))*.