Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
doanh gian » doanh giao, doanh giai, dan gian
cach hoc » cach thuc, cach thoi, dich hoc
mon hoan » mon hoa, mon toan, cong hoan
cong hoc » dong hoc, cong hoa, cong coc
gian dan » gian lang
tu cach » tu cac
cuu mon » cuu mo, cuu mot, cuu cong
mai voi » mai doi, mai hoi, sai voi
moi voi » doi voi, moi doi, moi thoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach hoc tap, nghien cuu mon hoan thanh cong hoc ((mai voi) OR (moi voi)) doanh gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach hoc tap, nghien cuu mon hoan thanh cong hoc ((mai voi) OR (moi voi)) doanh gian dan".
• Adding a wildcard symbol may retrieve word variants: tu cach hoc tap, nghien cuu mon hoan thanh cong hoc ((mai voi) OR (moi voi)) doanh gian dan*.