Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
tinh doi » trinh doc, trinh do, tinh hoc
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
cua tre » cuu tre, cua triet, dua tren
sach o » sach lo, sach y, mach o
ve nam » he nam, va nam, le nam
cua te » cua tu

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 o) OR (sac o)) lang xa hoi. hieu ve nam thuc va tinh doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach o) OR (sac o)) lang xa hoi. hieu ve nam thuc va tinh doi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach o) OR (sac o)) lang xa hoi. hieu ve nam thuc va tinh doi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc ((sach o) OR (sac o)) lang xa hoi. hieu ve nam thuc va tinh doi ((cua tre) or (cua te))*.