Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
pham tai » pham van
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma

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 nang xa hoi. hieu van ((pham tai) OR (pham thi)) va tinh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. hieu van ((pham tai) OR (pham thi)) va tinh vi ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. hieu van ((pham tai) OR (pham thi)) va tinh vi ((cua triet) or (va triet))*".