Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nang noi » nang doc
sang cho » danh cho, dung cho, sang tao
van cau » van dau, van hau, van chat
phuc va » thuc va, chuc va, thuc vat
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
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: su sach y ((nang noi) or (sang cho)) hoi. hieu van cau ((phuc va) or (phuc vu)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang noi) OR (sang cho)) hoi. hieu van cau ((phuc va) OR (phuc vu)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang noi) or (sang cho)) hoi. hieu van cau ((phuc va) or (phuc vu)) hanh vi cua tre*.