Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
va chua » vua chua, ca chua, va chu
hieu ve » hieu va, hieu van
hieu vu » hieu va, hieu su, dieu vu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. ((hieu vu) OR (hieu ve)) cham duc va thanh ((va chua) or (va cau)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu vu) OR (hieu ve)) cham duc va thanh ((va chua) OR (va cau)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu vu) OR (hieu ve)) cham duc va thanh ((va chua) or (va cau)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu vu) OR (hieu ve)) cham duc va thanh ((va chua) or (va cau)) te*.