Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
cham luc » cham soc, nhan luc, cham cuu
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, tu cach
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
te sach » toc sach
vu cham » va cham, vu kham, tu cham
y nang » ky nang, ly nang, v nang
vi su » va su, ve su, ki su

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 xa hoi. hieu vu cham luc ((van hanh) OR (van thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang xa hoi. hieu vu cham luc ((van hanh) OR (van thanh)) vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang xa hoi. hieu vu cham luc ((van hanh) OR (van thanh)) vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang xa hoi. hieu vu cham luc ((van hanh) OR (van thanh)) vi su triet*.