Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
doan vi » doan va, don vi, doan thi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
dan vi » don vi, dan va, gan vi

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang xa hoi. thien van cham duc va ((dan vi) OR (doan vi)) su triet~".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang xa hoi. thien van cham duc va ((dan vi) OR (doan vi)) su triet*.