Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
cua triet » cua viet, su triet, va triet
quoc bao » quoc oai, hoc bao, quoc va
dang mau » dong mau, dang van, dang su
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
mau hoi » cau hoi, mai hoi, mau ho
ky dang » ky nang, ky danh
va cam » va cham, va cac, va cao

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 ky dang mau hoi. hieu va cam ((duc tan) or (quoc bao)) thanh hai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang mau hoi. hieu va cam ((duc tan) OR (quoc bao)) thanh hai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang mau hoi. hieu va cam ((duc tan) or (quoc bao)) thanh hai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang mau hoi. hieu va cam ((duc tan) or (quoc bao)) thanh hai ((cua tre) OR (cua triet))*.