Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc gia » nuoc giai, nuoc giao, quoc gia
dua tren » dung tren
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo

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 ty lang xa hoi. hieu va cac nuoc gia thanh lai ((dua tren) or (((cuu tre) or (dau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. hieu va cac nuoc gia thanh lai ((dua tren) OR (((cuu tre) OR (dau tren)))).
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. hieu va cac nuoc gia thanh lai ((dua tren) or (((cuu tre) or (dau tren))))*.