Perhaps you should try some spelling variations:
ban hanh » ban hang
lang dai » lang hai, lang mai, lang chai
van hanh » van thanh, van anh, van ban
so sach » so sanh, bo sach, co sach
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cam luc » cam xuc, cau luc
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((lang dai) OR (nang luc)) hoi. hieu ve cam luc ((van hanh) OR (ban hanh)) hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((lang dai) or (nang luc)) hoi. hieu ve cam luc ((van hanh) OR (ban hanh)) hai cua te~".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((lang dai) or (nang luc)) hoi. hieu ve cam luc ((van hanh) OR (ban hanh)) hai cua te*.