Perhaps you should try some spelling variations:
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach 2, sach vay
loc va » luc va
hoc de » hoc he, hoc te, hoc do
de cua » le cua, te cua, dieu cua
cua te » cua tu

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 v) OR (sach y)) nang xa hoi. hieu vu kham ((loc va) OR (hoc va)) hoc de cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang xa hoi. hieu vu kham ((loc va) OR (hoc va)) hoc de cua te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu vu kham ((loc va) OR (hoc va)) hoc de cua te*.