Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tao lang » tai lang, tao bang, tao mang
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
hieu ve » hieu van
cam tu » cam thu, nam tu, dam tu
o lang » hoa lang, hoi lang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((o lang) OR (tao lang)) xa hoi. ((hieu ve) OR (hieu va)) cam tu va danh va su triet~.
• Adding a wildcard symbol may retrieve word variants: so sach ((o lang) or (tao lang)) xa hoi. ((hieu ve) or (hieu va)) cam tu va danh va su triet*.