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
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
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: te ((sach ky) OR (sac 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: "te ((sach ky) OR (sac ky)) nang xa hoi. dieu hien cac ((lao va) or (cao va)) dinh ve cua triet~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang xa hoi. dieu hien cac ((lao va) or (cao va)) dinh ve cua triet*.