Perhaps you should try some spelling variations:
nhan luc » nang luc
dieu cua » dieu tra
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hau luc » hau loc, cau luc, hieu luc
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
de cua » le cua, te cua
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach v nang xa hoi. hieu van ((hau luc) or (nhan luc)) van hanh ((de cua) OR (dieu cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang xa hoi. hieu van ((hau luc) OR (nhan luc)) van hanh ((de cua) OR (dieu cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang xa hoi. hieu van ((hau luc) or (nhan luc)) van hanh ((de cua) OR (dieu cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach v nang xa hoi. hieu van ((hau luc) or (nhan luc)) van hanh ((de cua) OR (dieu cua)) tre*.