Perhaps you should try some spelling variations:
cham xuan » pham xuan, pham luan, phan xuan
pham tuan » pham luan, pham xuan, pham thanh
hieu van » thien van, lieu va, hieu ve
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
anh hoi » anh noi, anh hoc, anh khoa
hoi cua » hoi chuc
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: so sach ky nang x hoi. ((hieu van) or (hieu va)) ((cham xuan) OR (pham tuan)) tuan anh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang x hoi. ((hieu van) OR (hieu va)) ((cham xuan) OR (pham tuan)) tuan anh hoi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. ((hieu van) or (hieu va)) ((cham xuan) OR (pham tuan)) tuan anh hoi cua tre*".