Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va
dinh dat » dinh ket, dinh van, dinh lam
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
dat su » sat su
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. ((hieu ve) or (((hieu van) OR (thien van)))) am thuc va dinh dat su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu ve) OR (((hieu van) OR (thien van)))) am thuc va dinh dat su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. ((hieu ve) or (((hieu van) OR (thien van)))) am thuc va dinh dat su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu ve) or (((hieu van) OR (thien van)))) am thuc va dinh dat su triet*.