Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
ban thanh » ban hanh, ban hang
cham qua » pham quan, cham giua, cau qua
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
hoi cuu » hoi chu, hoi cua, ho cuu
qua ban » cua ban, qua quan
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
dai moi » doi moi, dai hoi
mai hoi » mai khoi, dai hoi, lai 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 ky nang ((mai hoi) or (dai moi)). ((hieu ve) OR (hieu va)) cham qua ban thanh hoi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((mai hoi) OR (dai moi)). ((hieu ve) OR (hieu va)) cham qua ban thanh hoi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((mai hoi) or (dai moi)). ((hieu ve) OR (hieu va)) cham qua ban thanh hoi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((mai hoi) or (dai moi)). ((hieu ve) OR (hieu va)) cham qua ban thanh hoi cuu tre*.