Perhaps you should try some spelling variations:
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
su tien » su kien, su hien, tu tieng
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
va dau » va dao
dau vi » dau ve, dau va, dat vi
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((nang xa) or (lang xa)) hoi. hieu ((ve cham) OR (vu cham)) thuc va dau vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (lang xa)) hoi. hieu ((ve cham) OR (vu cham)) thuc va dau vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (lang xa)) hoi. hieu ((ve cham) OR (vu cham)) thuc va dau vi su tien".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (lang xa)) hoi. hieu ((ve cham) OR (vu cham)) thuc va dau vi su tien*.