Perhaps you should try some spelling variations:
khanh luan » khanh thuan, doanh luan, hang luan
cua triet » cua viet, su triet, va triet
khanh lai » thanh lap, thanh loi, hanh lam
cac tuc » cac toc, cac tu, cac tac
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac

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 bach)) y nang ma hoa. hieu ve cac tuc xa ((khanh lai) OR (khanh luan)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) y nang ma hoa. hieu ve cac tuc xa ((khanh lai) OR (khanh luan)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) y nang ma hoa. hieu ve cac tuc xa ((khanh lai) OR (khanh luan)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) y nang ma hoa. hieu ve cac tuc xa ((khanh lai) OR (khanh luan)) cua triet*.