Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (co sach)) ky nang xa hoi. hieu ((ve cam) or (vien da)) duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky nang xa hoi. hieu ((ve cam) OR (vien da)) duc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ky nang xa hoi. hieu ((ve cam) or (vien da)) duc va hanh vi cua tre*.