Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
cau triet » cau trieu, su triet, cua triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va thanh » gia thanh, ban thanh, va tinh
cau treo » cau theo, cau tren, cau trieu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 hoi. hieu qua ((cam xuc) or (cac nuoc)) va thanh hai ((cau treo) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hoi. hieu qua ((cam xuc) OR (cac nuoc)) va thanh hai ((cau treo) OR (cau triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. hieu qua ((cam xuc) or (cac nuoc)) va thanh hai ((cau treo) or (cau triet))*.