Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
cao hoat » cac hoat, co hoat, cao chat
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
lam tu » nam tu, cam tu, dam tu
va cua » va chua, via cua, ca cua

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 y nang cao hoat. ((hieu viec) OR (hieu ve)) lam tu va hang va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang cao hoat. ((hieu viec) OR (hieu ve)) lam tu va hang va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cao hoat. ((hieu viec) OR (hieu ve)) lam tu va hang va cua tre*.