Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
hang di » hang doi, hang vi, hang dien
cuu tre » cua tre, cau tren, cau treo
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: vu sach ty lang xa hoi. lieu va dau tuc van ((hanh vi) or (hang di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty lang xa hoi. lieu va dau tuc van ((hanh vi) OR (hang di)) cuu tre*.