Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
ban danh » ban doanh, ban dan, van danh
ban hanh » ban hang
tu sach » su sach, te sach, tu cach
cao hoi » cau hoi, co hoi, cao hoc
cam cuc » cam xuc, cham cuu, pham cuc
so viet » hoc viet
va cam » va cham, va cac, va cao
vi so » vi soi, vi mo, va so

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) OR (thu sach)) ky nang cao hoi. lieu va cam cuc ((ban danh) or (ban hanh)) vi so viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang cao hoi. lieu va cam cuc ((ban danh) OR (ban hanh)) vi so viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang cao hoi. lieu va cam cuc ((ban danh) or (ban hanh)) vi so viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang cao hoi. lieu va cam cuc ((ban danh) or (ban hanh)) vi so viet*.