Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh loi » thanh hoa, thanh hai, thanh lap
hieu van » thien van, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
toc sac » toc sach, hoc sach, doc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
loi cuu » loi cau, loi luu, loai cua
cuu tre » cua tre, cau tren, cau treo

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 (toc san)) ky nang xa hoi. ((hieu van) OR (hieu va)) nam thuc day thanh loi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (toc san)) ky nang xa hoi. ((hieu van) OR (hieu va)) nam thuc day thanh loi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) or (toc san)) ky nang xa hoi. ((hieu van) OR (hieu va)) nam thuc day thanh loi cuu tre*".