Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
thuc dan » thuc hanh, thuc vat
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va hoc » van hoc

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

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