Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
cat va » chat va, cat van, dat va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ma hoi. hieu ((ve cham) or (va cam)) loc ((van hanh) OR (ban hanh)) cat va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu ((ve cham) OR (va cam)) loc ((van hanh) OR (ban hanh)) cat va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu ((ve cham) or (va cam)) loc ((van hanh) OR (ban hanh)) cat va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu ((ve cham) or (va cam)) loc ((van hanh) OR (ban hanh)) cat va triet*.