Perhaps you should try some spelling variations:
phung thoi » phung thi, nhung thoi, phuong troi
nhung vay » nhung van, nhung cay, nhung thay
dan khoa » dang khoa, da khoa, san khoa
khoa mot » khoan mot, hoa mot, khoa mong
vay luan » ly luan, von luan, bai luan
tac dong » tac dung, tac trong, ha dong
dong hoc » dong co, dong luc
quen va » quan va, que va, quyen van
hoc mo » hoc moi, hoc mot, hoc mon

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( phung thoi quen va. hoc dan khoa mot ) or ( nhung vay luan van. tac dong hoc mo ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( phung thoi quen va. hoc dan khoa mot ) OR ( nhung vay luan van. tac dong hoc mo )).
• Adding a wildcard symbol may retrieve word variants: (( phung thoi quen va. hoc dan khoa mot ) or ( nhung vay luan van. tac dong hoc mo ))*.