Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan
tai cuu » tai buu, tai cua, thai cua
san ky » sang ky, van ky, dan ky
va nay » va ngay, va cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc san ky dang xa hoi. hieu va nay ((thuc va) or (thuc day)) dan ((tai cuu) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky dang xa hoi. hieu va nay ((thuc va) OR (thuc day)) dan ((tai cuu) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc san ky dang xa hoi. hieu va nay ((thuc va) or (thuc day)) dan ((tai cuu) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: toc san ky dang xa hoi. hieu va nay ((thuc va) or (thuc day)) dan ((tai cuu) OR (tai cuc)) tre*.