Perhaps you should try some spelling variations:
khanh luan » khanh thuan, doanh luan, hang luan
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam tu
xa khanh » xa thanh, van khanh, dat khanh
luan cua » quan cua, lua cua, luat cua
su sach » so sach
vu sach » vu bach, vu khach
nang ma » tang ma, sang ma, nang cao
hieu le » hieu ve, hieu he, hieu ly
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: ((su sach) or (vu sach)) y nang ma hoa. hieu le ((nam thuc) OR (nam thu)) xa khanh luan cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ma hoa. hieu le ((nam thuc) OR (nam thu)) xa khanh luan cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang ma hoa. hieu le ((nam thuc) OR (nam thu)) xa khanh luan cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ma hoa. hieu le ((nam thuc) OR (nam thu)) xa khanh luan cua triet*.