Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach
vu sach » vu bach, vu khach
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va dau » va dao

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)) ty hang xa hoi. lieu va dau tuc van hanh vi ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty hang xa hoi. lieu va dau tuc van hanh vi ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ty hang xa hoi. lieu va dau tuc van hanh vi ((cuu tre) OR (cua tre))*".