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, thi hang, thu hang
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
cuu tre » cua tre, cau tren, cau treo
va dau » va dao
vi cuu » vi luu, vinh cuu

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