Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
su tien » su hien, tu tieng, dau tien
va dau » va dao
dau vi » dau ve, dau va, dat vi
kien » bien, vien, dien

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 ky nang xa hoi. hieu ve cham thuc va dau vi ((su tien) OR (su kien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ve cham thuc va dau vi ((su tien) OR (su kien))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ve cham thuc va dau vi ((su tien) OR (su kien))*.