Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
phan vung » phan ung, phan cung, phan hung
mach hoc » cach hoc, dich hoc, anh hoc
cong hoc » cong hoa, cong coc, cong ho
dong hoc » dong co, dong luc
vung moc » dung mo, dung moi, dung mot
van nhan » van phan, van thanh, danh nhan
nhan tai » hang tai, van tai, toan tai
tu mach » tu cach, tu manh, tu hach
hoi van » hoi va, hoi dan, hai van
moc xa » hoc xa, uoc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tap, nghien cac ((cong hoc) OR (dong hoc)) phan vung moc xa hoi van nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cac ((cong hoc) OR (dong hoc)) phan vung moc xa hoi van nhan tai*".