Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
thanh do » thanh de, thanh pho, thanh hoa
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
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: toc sach ky nang xa hoi. hieu van nam thuc day ((thanh loi) or (thanh do)) ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu van nam thuc day ((thanh loi) OR (thanh do)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu van nam thuc day ((thanh loi) or (thanh do)) ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van nam thuc day ((thanh loi) or (thanh do)) ((cua tre) OR (cua te))*.