Perhaps you should try some spelling variations:
thanh pham » thanh phan, thanh pho, thanh hai
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cu tren » tu tren
cu tre » cua tre, cuu tre, cu tri

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thi thanh pham duc va hanh tinh ((cu tre) or (((cu tren) OR (dua tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thi thanh pham duc va hanh tinh ((cu tre) OR (((cu tren) OR (dua tren))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thi thanh pham duc va hanh tinh ((cu tre) or (((cu tren) OR (dua tren))))*".