Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh doi » trinh doc, trinh do, tinh hoc
lang xa » lang ha, dang xay, lang van
nam duc » nam duoc, pham duc, nam thuc
tinh di » trinh di, tinh da, tin di
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, dan ky, ban ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) or (van ky)) lang xa hoi. hieu van nam duc va ((tinh di) OR (tinh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (van ky)) lang xa hoi. hieu van nam duc va ((tinh di) OR (tinh doi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) or (van ky)) lang xa hoi. hieu van nam duc va ((tinh di) OR (tinh doi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) or (van ky)) lang xa hoi. hieu van nam duc va ((tinh di) OR (tinh doi)) cua tre*.