Perhaps you should try some spelling variations:
khanh cuu » hanh cua, khao cuu, khang cu
khan cua » nhan cua, than cua, han cua
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach 2, sach vay
ve dan » ke dan, le dan, va dan
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di 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 ((khanh cuu) OR (khan cua)) ve dan vi 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 ((khanh cuu) OR (khan cua)) ve dan vi cua te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu vu ((khanh cuu) OR (khan cua)) ve dan vi cua te*.