Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hang di » hang doi, hang vi, hang dien
dao tuc » dao duc
dau tuc » dau tu, cau truc, dau nuoc
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
di cua » dai cua, doi cua, de cua
x hoi » o hoi, x ho, 5 hoi

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