Perhaps you should try some spelling variations:
than dieu » nhan dieu, thuat dieu, thong dieu
nang doc » nang luc
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat cua » nhat cua, chat va, chat huu
han dieu » nhan dieu, lan dieu, hoang dieu
doc sac » doc sach, dac sac, hoc sach
doc hoi » duoc hoi, hoc hoi, doc hai
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
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 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 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 ky nang doc hoi. hieu van chat cua va ((han dieu) or (than dieu)) cua tre*.