Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
coc duc » hoc duc, hoc duoc, ngoc duc
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
_ danh » _ doanh, _ dan, 1 danh
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ky dang) or (_ danh)) xa hoi. hieu va ((coc duc) OR (coc luc)) va tinh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky dang) OR (_ danh)) xa hoi. hieu va ((coc duc) OR (coc luc)) va tinh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ky dang) or (_ danh)) xa hoi. hieu va ((coc duc) OR (coc luc)) va tinh vi va triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((ky dang) or (_ danh)) xa hoi. hieu va ((coc duc) OR (coc luc)) va tinh vi va triet*.