Perhaps you should try some spelling variations:
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
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
cua tre » cuu tre, cua triet, dua tren
ve cac » va cac, vien cac
cua te » cua tu

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: te sach ty nang xa hoi. hieu ve cac duc va ((chinh tri) OR (dinh ket)) ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu ve cac duc va ((chinh tri) or (dinh ket)) ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu ve cac duc va ((chinh tri) or (dinh ket)) ((cua tre) OR (cua te))*.