Perhaps you should try some spelling variations:
khanh lai » khanh luan, thanh lap, thanh loi
chat tuc » chat xuc, luat tuc, chat huu
nang mai » nang ma, nang tai, lang mai
su triet » su tien, ve triet
xa khanh » xa thanh, van khanh, dat khanh
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
su viet » so viet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang mai hoi. ((hieu ve) or (hieu va)) chat tuc xa khanh lai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang mai hoi. ((hieu ve) OR (hieu va)) chat tuc xa khanh lai ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: so sach y nang mai hoi. ((hieu ve) or (hieu va)) chat tuc xa khanh lai ((su triet) or (su viet))*.