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
thu sach » thuat sach, thuoc sach, thu hoach
lanh hai » manh hai, thanh hai, lang chai
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cao » va cao, ve bao, ve cac
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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) or (thu sach)) y nang x hoi. hieu ve 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) OR (thu sach)) y nang x hoi. hieu ve cao quoc ban ((lanh hai) OR (mlanh hai)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang x hoi. hieu ve cao quoc ban ((lanh hai) or (mlanh hai)) cuu tre*.