Perhaps you should try some spelling variations:
tay quang » tac quang, tai quang, tao quang
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cam thu » nam thu, cac thu, ca thu
su sach » so sach, vu sach
hieu ve » hieu van
y lang » o lang, _ lang, tay lang
thu va » thuc va, thue va, tu va
vi su » va su, ve su, ki su

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 ((y lang) or (tay quang)) xa hoi. ((hieu ve) or (hieu va)) cam thu va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y lang) OR (tay quang)) xa hoi. ((hieu ve) OR (hieu va)) cam thu va hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((y lang) or (tay quang)) xa hoi. ((hieu ve) or (hieu va)) cam thu va hanh vi su triet*.