Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
luan chat » luan chi, van chat, luan phan
dinh luan » dinh xuan, binh luan, dinh duan
hieu van » thien van, lieu va, hieu ve
chat xuc » chat huu, cam xuc, chao xu
sach ty » sach y, sach tu, sach thu
va dinh » van dinh, va kinh, va tinh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang

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 ty nang xa hoi. ((hieu van) OR (hieu va)) ((hac xuc) or (chat xuc)) va dinh luan chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu van) OR (hieu va)) ((hac xuc) OR (chat xuc)) va dinh luan chat triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu van) OR (hieu va)) ((hac xuc) or (chat xuc)) va dinh luan chat triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu van) OR (hieu va)) ((hac xuc) or (chat xuc)) va dinh luan chat triet*.