Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
cac lo » cac lop, cac co, cac bo
cua te » cua tu
lo va » lo van, lao va, ly va

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

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