Perhaps you should try some spelling variations:
thuan danh » thuan dinh, nhuan doanh, thuan thanh
tuan thuan » xuan thuan, tuan thu, tran tuan
pham tuan » pham luan, pham xuan, pham thanh
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
danh di » danh du, xanh di, danh dien
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach uu
ve pham » vi pham, v pham, ve phan
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: tu ((sach ty) or (sach tu)) nang x hoi. hieu ve pham tuan thuan danh di ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang x hoi. hieu ve pham tuan thuan danh di ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang x hoi. hieu ve pham tuan thuan danh di ((cua tre) or (cau tren))*.