Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc tan, duc manh
tai cau » tai cac, tai cao

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