Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
day thanh » dao thanh, dat thanh, da thanh
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
dong cua » dung cua, cong cua, huong cua
ky lang » ky dang, ky tang, tay lang
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 sach ((ky lang) OR (ky nang)) xa hoi. hieu van nam thuc day thanh dong cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky nang)) xa hoi. hieu van nam thuc day thanh dong cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky nang)) xa hoi. hieu van nam thuc day thanh dong cua tre*.