Perhaps you should try some spelling variations:
nhan thuc » nhan luc, toan thuc
su triet » su viet, su tien, ve triet
phan dau » phan tu, hang dau
day phan » dam phan, duy phan, dan phan
dan thuc » dan toc, am thuc
sach ty » sach y, sach thu, xach tay
nang ho » nang hoc, nang co, tang ho
sach tu » sach thu, cach tu, sach uu
hieu vu » hieu va, hieu ve, hieu su
ho hoi » hoc hoi, hoa hoi, hoi hoi
dau su » dau tu, dan su, da su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach tu)) nang ho hoi. hieu vu ((nhan thuc) or (dan thuc)) day phan dau su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) nang ho hoi. hieu vu ((nhan thuc) OR (dan thuc)) day phan dau su triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach tu)) nang ho hoi. hieu vu ((nhan thuc) or (dan thuc)) day phan dau su triet*.