Perhaps you should try some spelling variations:
hanh dao » lanh dao, thanh dat, thanh dam
dao huu » do huu
va hanh » van hanh, va thanh, va danh
cac cap » cao cap, cac cam, cac cau
cac lap » cac lop, cac tap, cac loai
nang xa » nang x, lang xa, nang ma
huu tre » huu tri, cuu tre, huu them
xac ky » cac ky, sac ky
bac ky » cac ky, ban ky, sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((xac ky) or (bac ky)) nang xa hoi. hieu qua ((cac lap) OR (cac cap)) va hanh dao huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((xac ky) OR (bac ky)) nang xa hoi. hieu qua ((cac lap) OR (cac cap)) va hanh dao huu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((xac ky) or (bac ky)) nang xa hoi. hieu qua ((cac lap) OR (cac cap)) va hanh dao huu tre*".