Perhaps you should try some spelling variations:
cac quoc » cac nuoc, cac cuoc, cao quoc
thanh va » thanh van, hanh va, thanh ha
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau treo
y xang » ty xang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y xang xa hoi. hieu va cac quoc gia ((hanh vi) or (thanh va)) ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y xang xa hoi. hieu va cac quoc gia ((hanh vi) OR (thanh va)) ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y xang xa hoi. hieu va cac quoc gia ((hanh vi) or (thanh va)) ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach y xang xa hoi. hieu va cac quoc gia ((hanh vi) or (thanh va)) ((cuu tre) OR (cau tren))*.