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 hien » su tien, thu hien, nhu hien
va dau » va dao
dau vi » dau ve, dau va, dat vi
kien » bien, vien, tien

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 hien) or (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ve cham thuc va dau vi ((su hien) 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 hien) or (su kien))*.