Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
chong hoc » chong doc, thong hoc, thuong hoc
chung hoc » trung hoc, dung hoc, hung hoa
manh toan » thanh toan, anh tuan, tinh toan
minh hoc » sinh hoc, hinh hoc, tinh hoc
hoc phan » hoc dan, hoc pho
hoi manh » ho manh, hoi danh, hoi thanh
toan tai » toan tap, doanh tai, toan ban
tu minh » thu minh, vu minh, thi minh
mot hoc » mon hoc, mo hoc, mot goc
mai hoi » mai khoi, dai hoi, lai hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu minh hoc tap, nghien cua mot hoc phan ((chong hoc) or (chung hoc)) mai hoi manh toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu minh hoc tap, nghien cua mot hoc phan ((chong hoc) OR (chung hoc)) mai hoi manh toan tai.
• Adding a wildcard symbol may retrieve word variants: tu minh hoc tap, nghien cua mot hoc phan ((chong hoc) or (chung hoc)) mai hoi manh toan tai*.