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nghien cua » nghien cuu, nghiep cua, nghiep vua
cach tuc » cach thuc, cach tu, bach tuoc
cong hoc » dong hoc, cong hoa, cong coc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
cac nhan » ca nhan, cac nha, cam nhan
nhan tai » hang tai, van tai, toan tai
tu cach » tu cac
hoi cac » hoc cac, voi cac, hoa cac
hoc xa » hoc ma
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