Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
suc danh » suc canh, sach danh, chuc danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((nang xa) or (lang xa)) hoi. hieu ve cam ((suc danh) OR (suc manh)) thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((nang xa) OR (lang xa)) hoi. hieu ve cam ((suc danh) OR (suc manh)) thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((nang xa) or (lang xa)) hoi. hieu ve cam ((suc danh) OR (suc manh)) thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((nang xa) or (lang xa)) hoi. hieu ve cam ((suc danh) OR (suc manh)) thanh tai cua tre*.