Perhaps you should try some spelling variations:
sach vuc » sach duoc, sach nuoc, sach truc
vuc nang » cuc nang, vu nang, chuc nang
su triet » su viet, ve triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
tu sach » thu sach, su sach, te sach
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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 vuc nang ma hoi. hieu va cam luc ((van hanh) or (ban hanh)) ki ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vuc nang ma hoi. hieu va cam luc ((van hanh) OR (ban hanh)) ki ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vuc nang ma hoi. hieu va cam luc ((van hanh) or (ban hanh)) ki ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: tu sach vuc nang ma hoi. hieu va cam luc ((van hanh) or (ban hanh)) ki ((su triet) OR (su tien))*.