Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
lang van » dang van, tang van, hoang van
viec cam » viec lam, viec cua, viec va
hay tinh » may tinh, huy tinh, tay tinh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay
ha tinh » va tinh, may tinh
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu 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 ((lang xa) or (lang van)) hoi. hieu viec cam xuc ((hay tinh) OR (ha tinh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (lang van)) hoi. hieu viec cam xuc ((hay tinh) OR (ha tinh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) or (lang van)) hoi. hieu viec cam xuc ((hay tinh) OR (ha tinh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (lang van)) hoi. hieu viec cam xuc ((hay tinh) OR (ha tinh)) de cua tre*.