Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach
cua tre » cua te, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
vu sach » vu bach, vu khach
cuu tre » cau tren, cau treo
va dau » va dao
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: ((su sach) or (vu sach)) ky nang x hoi. lieu va dau tuc van hanh di ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. lieu va dau tuc van hanh di ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang x hoi. lieu va dau tuc van hanh di ((cua tre) OR (cuu tre))*".