Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
ta thanh » tai thanh, va thanh, ha thanh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
nam tuc » nam thuc, nam truc, nam tu
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, ha nam, va nay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ky nang ma hoi. hieu va nam tuc ((van khanh) or (ta thanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang ma hoi. hieu va nam tuc ((van khanh) OR (ta thanh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang ma hoi. hieu va nam tuc ((van khanh) or (ta thanh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang ma hoi. hieu va nam tuc ((van khanh) or (ta thanh)) vai cuu tre*.