Perhaps you should try some spelling variations:
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, huong cua, thong cua
cong cua » cong cu, huong cua, thong cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma

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 ((dong cua) or (cong cua)) tre~.
• 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 ((dong cua) OR (cong cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van nam thuc day thanh ((dong cua) or (cong cua)) tre*.