Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
cuu thuc » cuu tac
khanh te » khanh tra, khanh thu, kinh te
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
cua tuc » cua tu, cua thuoc, luat tuc
van cuu » van cau, van chu, van cu
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua duc » cua nuoc, cua quoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van cuu thuc dan khanh te ((cua tuc) or (cua duc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van cuu thuc dan khanh te ((cua tuc) OR (cua duc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. hieu van cuu thuc dan khanh te ((cua tuc) or (cua duc))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van cuu thuc dan khanh te ((cua tuc) or (cua duc))*.