Perhaps you should try some spelling variations:
thanh hoa » thanh pho
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
ve giao » te giao, viet giao, van giao
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ((mai hoi) OR (dai hoi)). hieu ve giao duc van ((thanh hoa) or (dung tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((mai hoi) OR (dai hoi)). hieu ve giao duc van ((thanh hoa) OR (dung tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((mai hoi) OR (dai hoi)). hieu ve giao duc van ((thanh hoa) or (dung tai)) cua tre*".