Perhaps you should try some spelling variations:
than dieu » nhan dieu, thuat dieu, thong dieu
chat cua » nhat cua, chat va, chat huu
van chat » cao chat
nang doc » nang luc
han dieu » nhan dieu, lan dieu, hoang dieu
hieu van » hieu va, thien van, lieu va
doc sac » doc sach, hoc sach, toc sach
cua tre » cua te, cuu tre, cua triet
doc hoi » duoc hoi, hoc hoi, doc hai
cua va » cua vat, chua va, cua van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sac) OR (dac sac)) ky nang doc hoi. hieu van chat cua va ((han dieu) or (than dieu)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sac) OR (dac sac)) ky nang doc hoi. hieu van chat cua va ((han dieu) OR (than dieu)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sac) OR (dac sac)) ky nang doc hoi. hieu van chat cua va ((han dieu) or (than dieu)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((doc sac) OR (dac sac)) ky nang doc hoi. hieu van chat cua va ((han dieu) or (than dieu)) cua tre*.