Perhaps you should try some spelling variations:
mlanh hai » manh hai, thanh hai, minh hai
cao quoc » cac quoc, cao thuoc, han quoc
quoc ban » quoc bao, quoc lan, quoc quan
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang

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 xa hoi. ((hieu ve) OR (hieu van)) cao quoc ban ((lanh hai) or (mlanh hai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu ve) OR (hieu van)) cao quoc ban ((lanh hai) OR (mlanh hai)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((hieu ve) OR (hieu van)) cao quoc ban ((lanh hai) or (mlanh hai)) cuu tre*".