Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dieu hien » dieu khien, dieu kien, bieu hien
hien cac » thien cac, vien cac, hieu cac
dinh ve » dinh ket, dinh van
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
lao va » tao va, bao va, dao va
cao va » cao van, tao va, co va
ve cua » le cua, de cua, te cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. dieu hien cac ((lao va) OR (cao va)) dinh ve cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. dieu hien cac ((lao va) or (cao va)) dinh ve cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. dieu hien cac ((lao va) or (cao va)) dinh ve cua triet*.