Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
cau theo » cau thi, cau tao
sach thu » sach thue, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
cac tuc » cac toc, cac tu, cac tac
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac

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 thu ((nang xa) OR (nang ma)) hoi. hieu ve cac tuc va thanh loi ((cua tre) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((nang xa) OR (nang ma)) hoi. hieu ve cac tuc va thanh loi ((cua tre) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang xa) OR (nang ma)) hoi. hieu ve cac tuc va thanh loi ((cua tre) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((nang xa) OR (nang ma)) hoi. hieu ve cac tuc va thanh loi ((cua tre) or (cau theo))*.