Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hieu van » hieu va, thien van, lieu va
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
thuc va » thuc vat, thuc dan, thuc day
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang
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 hoi. ((hieu ve) OR (hieu van)) 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 hoi. ((hieu ve) OR (hieu van)) cham thuc va dau vi su tien".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. ((hieu ve) OR (hieu van)) cham thuc va dau vi su tien*.