Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
ve triet » va trien, su triet
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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: su sach ky lang xa hoi. ((thieu bien) or (dien bien)) cac ((xuc va) OR (luc va)) thanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((thieu bien) OR (dien bien)) cac ((xuc va) OR (luc va)) thanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((thieu bien) or (dien bien)) cac ((xuc va) OR (luc va)) thanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((thieu bien) or (dien bien)) cac ((xuc va) OR (luc va)) thanh vi ve triet*.