Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
sach ky » sac ky, sach y, sach ty
te sach » toc sach
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: te sach ky nang o hoi. hieu van cau duc va thanh hai ((va trien) or (((su triet) OR (ve triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hoi. hieu van cau duc va thanh hai ((va trien) OR (((su triet) OR (ve triet))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hoi. hieu van cau duc va thanh hai ((va trien) or (((su triet) OR (ve triet))))*".