Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
lanh hai » manh hai, thanh hai, lang chai
thu san » thuy san, thu ban, phu san
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
san ky » sang ky, van ky, dan ky
cua te » cua tu

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 nang xa hoi. hieu van nam ((quoc ban) or (duc va)) lanh hai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang xa hoi. hieu van nam ((quoc ban) OR (duc va)) lanh hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky nang xa hoi. hieu van nam ((quoc ban) or (duc va)) lanh hai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu san ky nang xa hoi. hieu van nam ((quoc ban) or (duc va)) lanh hai ((cua tre) OR (cua te))*.