Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh hoai
nam thuc » nam thuoc, am thuc, nam thu
thuc dao » thuc dan, thuc day, chuc dao
thanh do » thanh de, thanh pho, thanh hoa
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
toc sac » toc sach, toc san, doc sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) or (hoc sach)) ky nang xa hoi. hieu van nam thuc dao ((thanh doi) OR (thanh do)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (hoc sach)) ky nang xa hoi. hieu van nam thuc dao ((thanh doi) OR (thanh do)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) or (hoc sach)) ky nang xa hoi. hieu van nam thuc dao ((thanh doi) OR (thanh do)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) or (hoc sach)) ky nang xa hoi. hieu van nam thuc dao ((thanh doi) OR (thanh do)) cua tre*.