Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dieu cua » dieu tra
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
de cua » le cua, te cua
tuan » quan, tran, luan

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 ky nang xa hoi. hieu qua cau luc ((van hanh) or (tuan anh)) ((de cua) OR (dieu cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu qua cau luc ((van hanh) OR (tuan anh)) ((de cua) OR (dieu cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu qua cau luc ((van hanh) or (tuan anh)) ((de cua) OR (dieu cua)) tre*".