Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thuc van » thuc vat, thuc dan, thuc va
su triet » su viet, su tien, ve triet
bo sach » co sach, hoc sach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
hang di » hang doi, hang vi, hang dien
ve cac » va cac, vien cac

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

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