Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
thuc va » thuc vat, thuc dan
dan tai » van tai, dan thi, han tai
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay

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

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