Perhaps you should try some spelling variations:
thien van » thi van
thu hanh » thuc hanh, thu thanh, thuy hanh
hieu van » hieu va, lieu va, hieu ve
hanh nam » thanh nam, hanh lam, hanh ngay
va triet » va thiet, va trien, ve triet
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hanh xa » hanh va, hanh ma, hanh xu
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) thu hanh xa hoi. ((hieu van) OR (thien van)) cam xuc va hanh nam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thu hanh xa hoi. ((hieu van) OR (thien van)) cam xuc va hanh nam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) thu hanh xa hoi. ((hieu van) OR (thien van)) cam xuc va hanh nam va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) thu hanh xa hoi. ((hieu van) OR (thien van)) cam xuc va hanh nam va triet*.