Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
cua quoc » cua nuoc, cua thuoc
cac nuoc » cap nuoc, hoc nuoc, cua nuoc
tai khoa » da khoa, noi khoa
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
lai hoi » dai hoi, lai hoa, lai roi
y nang » ky nang, ly nang, v nang

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 y nang ((tai khoa) or (lai hoi)). hieu va ((cac nuoc) or (dat nuoc)) ban thanh vai cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((tai khoa) OR (lai hoi)). hieu va ((cac nuoc) OR (dat nuoc)) ban thanh vai cua quoc.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((tai khoa) or (lai hoi)). hieu va ((cac nuoc) or (dat nuoc)) ban thanh vai cua quoc*.