Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam
va nay » va ngay, va cay
tu lap » truc lap
ky cua » ly 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 ky nang xa hoi. hieu ((va nam) or (va nay)) tu lap trinh ky cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((va nam) OR (va nay)) tu lap trinh ky cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((va nam) or (va nay)) tu lap trinh ky cua tre*.