Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ky trong » ly trong, ke trong, cay trong
trong xa » trong xay, trong ca, trong xu
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
danh vi » hanh vi, dinh vi, danh di
te sac » te sach, te cac, te san
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
vi ve » va ve, gi ve, ve ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (toc sach)) ky trong xa hoi. hieu ve cam ((xuc va) OR (duc va)) danh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (toc sach)) ky trong xa hoi. hieu ve cam ((xuc va) OR (duc va)) danh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (toc sach)) ky trong xa hoi. hieu ve cam ((xuc va) OR (duc va)) danh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (toc sach)) ky trong xa hoi. hieu ve cam ((xuc va) OR (duc va)) danh vi ve triet*.