Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va kinh, va tinh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
hien » bien, tien, dien

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 ty nang xa hoi. hieu ((vien dai) or (hien dai)) duc va dinh viet ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu ((vien dai) OR (hien dai)) duc va dinh viet ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu ((vien dai) or (hien dai)) duc va dinh viet ((cuu tre) OR (cua tre))*".