Perhaps you should try some spelling variations:
manh hai » lanh hai, minh hai, thanh hai
cac quoc » cac nuoc, cac cuoc, cao quoc
quoc lan » quoc ban, nuoc luan, quoc quan
tu sach » thu sach, su sach, te sach
anh hai » lanh hai, anh thai, anh bai
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
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: tu sach y nang xa hoi. hieu ve cac quoc lan ((anh hai) or (manh hai)) ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ve cac quoc lan ((anh hai) OR (manh hai)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ve cac quoc lan ((anh hai) or (manh hai)) ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ve cac quoc lan ((anh hai) or (manh hai)) ((cua tre) OR (cua te))*.