Perhaps you should try some spelling variations:
vien dai » hien dai
dien cac » vien cac, dien cuc, dien sach
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
lo van » le van, vo van, so van
lo va » lao va, ly va, le va

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 ky nang xa hoi. hieu ((dien cac) or (vien dai)) ((lo va) OR (lo van)) danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((dien cac) OR (vien dai)) ((lo va) OR (lo van)) danh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((dien cac) or (vien dai)) ((lo va) OR (lo van)) danh vai cua tre*".