Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
dan hang » ban hang, van hang, dat hang
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, co sach
qua cac » cua cac
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
di vat » di vao, i vat, dien vat
dai va » mai va
di va » di vao, doi va, do va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y lang xa hoi. hieu qua cac thuc dan hang ((((di va) OR (di vat))) or (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y lang xa hoi. hieu qua cac thuc dan hang ((((di va) OR (di vat))) OR (dai va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y lang xa hoi. hieu qua cac thuc dan hang ((((di va) OR (di vat))) or (dai va)) triet*".