Perhaps you should try some spelling variations:
khanh luc » khanh luan, khanh quoc, nhan luc
vu khanh » vu thanh, van khanh, duy khanh
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu vu » hieu va, hieu ve, hieu su
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) y nang ma hoi. hieu vu khanh luc van hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ma hoi. hieu vu khanh luc van hanh va su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang ma hoi. hieu vu khanh luc van hanh va su triet*.