Perhaps you should try some spelling variations:
te sach » toc sach
va dinh » van dinh, va kinh, va tinh
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cac duc » cao duc, cac dac, cac nuoc
sach ty » sach y, sach tu, sach thu
vi cua » di cua

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) OR (cac du)) va dinh ((vi cua) OR (vai 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) or (cac du)) va dinh ((vi cua) OR (vai cua)) te~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu ve ((cac duc) or (cac du)) va dinh ((vi cua) OR (vai cua)) te*.