Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat soc » cham soc, chat hoc, chat doc
hieu ve » hieu va, hieu van
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
ve chat » va chat, van chat
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc va
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: ((te sach) or (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu ve chat soc va tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu ve chat soc va tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu ve chat soc va tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu ve chat soc va tinh vi cua tre*.