Perhaps you should try some spelling variations:
hieu vat » nhieu vat, hieu va, hieu van
vat duoc » dat duoc, luat duoc, xuat duoc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
duoc tu » duc tu, duoc sua
va tinh » may tinh
va chua » vua chua, ca chua, va chu
va cua » via cua, ma cua, da cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. hieu vat duoc tu va tinh ((((va cua) or (va chua))) or (ca cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu vat duoc tu va tinh ((((va cua) OR (va chua))) OR (ca cua)) te.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu vat duoc tu va tinh ((((va cua) or (va chua))) or (ca cua)) te*.