Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » ban hanh, van anh, van ban
vinh cua » sinh cua, tinh cua, dinh cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
viec da » viec dat, vien da, viec va
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi

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 ((ma hoi) OR (ma hoa)). hieu viec da xuc ((van thanh) or (van hanh)) vinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (ma hoa)). hieu viec da xuc ((van thanh) OR (van hanh)) vinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (ma hoa)). hieu viec da xuc ((van thanh) or (van hanh)) vinh cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (ma hoa)). hieu viec da xuc ((van thanh) or (van hanh)) vinh cua tre*.