Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
vuc nang » cuc nang, chuc nang, van nang
cam luc » cam xuc
kien su » nien su, tien su, vien sau
cau luc » cau truc, cau phuc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
vu nang » va nang, vu dang, 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: tu sach ((vu nang) or (vuc nang)) mai hoi. hieu va ((cam luc) OR (cau luc)) van hanh kien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((vu nang) OR (vuc nang)) mai hoi. hieu va ((cam luc) OR (cau luc)) van hanh kien su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((vu nang) or (vuc nang)) mai hoi. hieu va ((cam luc) OR (cau luc)) van hanh kien su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((vu nang) or (vuc nang)) mai hoi. hieu va ((cam luc) OR (cau luc)) van hanh kien su triet*.