Perhaps you should try some spelling variations:
luc thanh » duc thanh, luu thanh, tuc thanh
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong luc » dong luc, cong suc, cong duc
cong hoc » dong hoc, cong hoa, cong coc
gian dan » gian lang
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi

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 hoc tap, nghien cuu cong luc thanh cong hoc ((ma hoi) OR (mai hoi)) dan gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien cuu cong luc thanh cong hoc ((ma hoi) OR (mai hoi)) dan gian dan".
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu cong luc thanh cong hoc ((ma hoi) OR (mai hoi)) dan gian dan*.