Perhaps you should try some spelling variations:
pham thuoc » pham thuc, phap thuoc, pham thuong
nham thuc » nhan thuc, nam thuc, nham thu
cham thuc » pham thuc, tham thuc, am thuc
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
su hien » su kien, su tien, thu hien
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 ky nang xa hoi. hieu ve ((((cham thuc) or (pham thuoc))) or (nham thuc)) va dau vi su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ve ((((cham thuc) OR (pham thuoc))) OR (nham thuc)) va dau vi su hien.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ve ((((cham thuc) or (pham thuoc))) or (nham thuc)) va dau vi su hien*.