Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
nhan thuc » nhan luc, dan thuc, toan thuc
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
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 ty nang xa hoi. hieu van ((cham thuc) or (nhan thuc)) va dau vi su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu van ((cham thuc) OR (nhan thuc)) va dau vi su hien.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu van ((cham thuc) or (nhan thuc)) va dau vi su hien*.