Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
thanh hai » thanh hoa, thanh san
qua pham » quan pham, quy pham, qua cham
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
cua tre » cuu tre, cua triet, dua tren
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hai » co hai, so hai, o lai

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 ky nang o hai. hieu qua pham duc van ((thanh hai) OR (thanh phan)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hai. hieu qua pham duc van ((thanh hai) OR (thanh phan)) ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang o hai. hieu qua pham duc van ((thanh hai) OR (thanh phan)) ((cua tre) or (cua te))*".