Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
xa thanh » va thanh, ha thanh, ta thanh
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
toc xa » tuc xa, toc ta, hoc xa
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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) OR (mai hoi)). hieu va cac toc xa thanh doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (mai hoi)). hieu va cac toc xa thanh doi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) OR (mai hoi)). hieu va cac toc xa thanh doi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) OR (mai hoi)). hieu va cac toc xa thanh doi ((cua tre) or (cua te))*.