Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
thuc day » thuc dan, thuc vat
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac
va nam » van nam, ha nam, va nay
sac ky » sai ky

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 ky) OR (cac ky)) lang xa hoi. hieu va nam ((thuc va) or (thuc day)) dan vai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sac ky) OR (cac ky)) lang xa hoi. hieu va nam ((thuc va) OR (thuc day)) dan vai cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sac ky) OR (cac ky)) lang xa hoi. hieu va nam ((thuc va) or (thuc day)) dan vai cau theo".
• Adding a wildcard symbol may retrieve word variants: toc ((sac ky) OR (cac ky)) lang xa hoi. hieu va nam ((thuc va) or (thuc day)) dan vai cau theo*.