Perhaps you should try some spelling variations:
thien van » thi van
quoc ban » quoc bao, quoc lan, quoc quan
lanh hai » manh hai, thanh hai, lang chai
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay, lang van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
san ky » van 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: thu ((san ky) OR (sang ky)) lang xa hoi. thien van nam ((quoc ban) or (duc va)) lanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((san ky) OR (sang ky)) lang xa hoi. thien van nam ((quoc ban) OR (duc va)) lanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((san ky) OR (sang ky)) lang xa hoi. thien van nam ((quoc ban) or (duc va)) lanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((san ky) OR (sang ky)) lang xa hoi. thien van nam ((quoc ban) or (duc va)) lanh hai cua tre*.