Perhaps you should try some spelling variations:
khang sinh » nhan sinh
khanh sinh » khanh linh, khanh vinh, nhan sinh
te sach » toc sach
duc ban » duc tan, duc van, dua ban
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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 (vu sach)) ky nang x hoi. hieu ve pham duc ban ((khanh sinh) OR (khang sinh)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky nang x hoi. hieu ve pham duc ban ((khanh sinh) OR (khang sinh)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) ky nang x hoi. hieu ve pham duc ban ((khanh sinh) OR (khang sinh)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky nang x hoi. hieu ve pham duc ban ((khanh sinh) OR (khang sinh)) cua tre*.