Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
hieu va » lieu va, hieu qua
vai cuu » vai cua
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: ((su sach) or (te sach)) ky nang ma hoa. ((hieu ve) OR (hieu va)) pham duc va thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang ma hoa. ((hieu ve) OR (hieu va)) pham duc va thanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang ma hoa. ((hieu ve) OR (hieu va)) pham duc va thanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang ma hoa. ((hieu ve) OR (hieu va)) pham duc va thanh vai cuu tre*.