Perhaps you should try some spelling variations:
van chat » cao chat
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, toan cau
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
luc va » duc va, tuc va, loc va
dai su » dai sua, dai so, lai su
dan su » dang su

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: tu sach ty nang xa hoi. hieu ((van cau) OR (van chat)) luc va hanh ((dai su) OR (dan su)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ((van cau) or (van chat)) luc va hanh ((dai su) OR (dan su)) viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((van cau) or (van chat)) luc va hanh ((dai su) OR (dan su)) viet*.