Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
ban thanh » ban hanh, ban hang
cham giua » tham gia, nhat giua, cam gia
cham qua » pham quan, cau qua, cac qua
tu sach » thu sach, su sach, te sach
hoi cuu » hoi chu, hoi cua, ho cuu
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
dai moi » doi moi, dai hoi
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo

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 moi)). hieu ve ((cham qua) OR (cham giua)) ban thanh hoi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((mai hoi) OR (dai moi)). hieu ve ((cham qua) OR (cham giua)) ban thanh hoi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((mai hoi) or (dai moi)). hieu ve ((cham qua) OR (cham giua)) ban thanh hoi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((mai hoi) or (dai moi)). hieu ve ((cham qua) OR (cham giua)) ban thanh hoi cuu tre*.