Perhaps you should try some spelling variations:
than luc » nhan luc, than duc, thanh luu
dieu cua » dieu tra
dien cua » dien cuc, dien cu, tien cua
tham luc » tham nuoc, tham thuc, nhan luc
co sach » bo sach, cuon sach, hoc sach
va hang » van hang, va nang, va lang
sach vu » sach va, sach tu, sach uu
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach vu nang xa hoi. lieu va ((tham luc) or (than luc)) va hang ((dien cua) OR (dieu cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach vu nang xa hoi. lieu va ((tham luc) OR (than luc)) va hang ((dien cua) OR (dieu cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach vu nang xa hoi. lieu va ((tham luc) or (than luc)) va hang ((dien cua) OR (dieu cua)) tre".
• Adding a wildcard symbol may retrieve word variants: co sach vu nang xa hoi. lieu va ((tham luc) or (than luc)) va hang ((dien cua) OR (dieu cua)) tre*.