Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
cau treo » cau theo, cau tren, cau triet
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
ve pham » vi pham, v pham, ve phan

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) or (te sach)) ky nang ma hoa. hieu ve pham duc van thanh vai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang ma hoa. hieu ve pham duc van thanh vai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang ma hoa. hieu ve pham duc van thanh vai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang ma hoa. hieu ve pham duc van thanh vai ((cuu tre) OR (cau treo))*.