Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
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, dau nuoc
cuu tre » cua tre, cau tren, cau treo
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 ty lang xa hoi. lieu va ((dau tuc) or (cau truc)) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty lang xa hoi. lieu va ((dau tuc) OR (cau truc)) van hanh vi cuu tre*.