Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
va cua » va chua, via cua, ca cua
cac lo » cac lop, cac co, cac bo
cua te » cua tu

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