Perhaps you should try some spelling variations:
thanh nam » hanh nam, thanh tam, thanh pham
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
cau duc » cao duc, cau luc, chu duc
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
co hoi » co hoc
va cau » van cau, va cac, va dau
nam su » nam suu, nam sau, nam 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 (su sach)) ky nang ((co hoi) OR (co loi)). hieu va cau duc va thanh nam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((co hoi) OR (co loi)). hieu va cau duc va thanh nam su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ((co hoi) OR (co loi)). hieu va cau duc va thanh nam su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ((co hoi) OR (co loi)). hieu va cau duc va thanh nam su triet*.