Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
cam quoc » cac quoc, nam quoc, han quoc
hoc sach » hoc sinh, hoc cac, hoc anh
cao quoc » cac quoc, cao thuoc, han quoc
te sach » toc sach
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

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 (hoc sach)) ky nang ma hoi. hieu va ((cam quoc) OR (cao quoc)) ban thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky nang ma hoi. hieu va ((cam quoc) OR (cao quoc)) ban thanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) ky nang ma hoi. hieu va ((cam quoc) OR (cao quoc)) ban thanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky nang ma hoi. hieu va ((cam quoc) OR (cao quoc)) ban thanh tai cuu tre*.