Perhaps you should try some spelling variations:
thu hang » thi hang, thuc hanh, thu huong
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
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 ((thu 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 ((thu hang) OR (ty xang)) xa hoi. lieu va dau tuc van hanh vi cuu tre*.