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
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
ca tren » cau tren, cu tren, la tren
tai ca » tai cac, tai cao, tai cua

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 ca 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 ca 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 ca tren*.