Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dan thanh » dang thanh, danh thanh, van thanh
va triet » va thiet, va trien, ve triet
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
lap va » tap va
ve cac » va cac, vien cac

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 ((y nang) or (ly nang)) ma hoa. hieu ve cac thuc ((dan thanh) OR (ban thanh)) lap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) ma hoa. hieu ve cac thuc ((dan thanh) OR (ban thanh)) lap va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ly nang)) ma hoa. hieu ve cac thuc ((dan thanh) OR (ban thanh)) lap va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ly nang)) ma hoa. hieu ve cac thuc ((dan thanh) OR (ban thanh)) lap va triet*.