Perhaps you should try some spelling variations:
chieu chien » thien chien, hieu hien
dieu hien » dieu khien, dieu kien, bieu hien
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
lao va » tao va, cao va, bao va
va cua » va chua, via cua, ca cua
cua te » cua tu
lo va » lo van, ly va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. ((dieu hien) or (chieu chien)) cac ((lo va) OR (lao va)) hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. ((dieu hien) OR (chieu chien)) cac ((lo va) OR (lao va)) hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. ((dieu hien) or (chieu chien)) cac ((lo va) OR (lao va)) hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. ((dieu hien) or (chieu chien)) cac ((lo va) OR (lao va)) hanh va cua te*.