Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
thanh do » thanh de, thanh pho, thanh hoa
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
cac tuc » cac tu, cac tac, cac nuoc
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
cua te » cua tu
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: su sach ky nang ma hoi. hieu va ((cac tuc) OR (cac toc)) xa thanh do ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu va ((cac tuc) OR (cac toc)) xa thanh do ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu va ((cac tuc) OR (cac toc)) xa thanh do ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu va ((cac tuc) OR (cac toc)) xa thanh do ((cua tre) or (cua te))*.