Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
lang xa » lang ha, dang xay, lang van
van lam » van nam
sach tu » sach thu, cach tu, sach ty
dan vai » dan va, dan vat, den vai
dan tai » van tai, dan thi, han tai
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 ((sach tu) or (sach y)) lang xa hoi. hieu van lam thuc day ((dan vai) OR (dan tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (sach y)) lang xa hoi. hieu van lam thuc day ((dan vai) OR (dan tai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) or (sach y)) lang xa hoi. hieu van lam thuc day ((dan vai) OR (dan tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) or (sach y)) lang xa hoi. hieu van lam thuc day ((dan vai) OR (dan tai)) cuu tre*.