Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
ban hang » ngan hang
phat duy » pham duy, phat huy, phan duy
hieu van » hieu va, lieu va, hieu ve
hang vi » hang va, hanh vi, hang di
duy ban » uy ban, duy van, duy can
mai hoi » mai khoi, dai hoi, lai hoi
san ky » sang ky, van ky, dan ky
me hoi » le hoi
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ((me hoi) or (mai hoi)). ((hieu van) OR (thien van)) phat duy ban hang vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((me hoi) OR (mai hoi)). ((hieu van) OR (thien van)) phat duy ban hang vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ((me hoi) or (mai hoi)). ((hieu van) OR (thien van)) phat duy ban hang vi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((me hoi) or (mai hoi)). ((hieu van) OR (thien van)) phat duy ban hang vi cua triet*.