Perhaps you should try some spelling variations:
cong tac » cong ty
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
dat tren » dat trong, dua tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky cong » ke cong, ly cong, khu cong
tac hoi » tao hoi, tay hoi, tac hai
va cham » va chat, va tham
vi dat » voi dat, vi dai, va dat

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 ky cong tac hoi. lieu va cham luc ((van hanh) OR (ban hanh)) vi dat tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky cong tac hoi. lieu va cham luc ((van hanh) OR (ban hanh)) vi dat tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky cong tac hoi. lieu va cham luc ((van hanh) OR (ban hanh)) vi dat tren*.