Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong
hanh trinh » canh tranh, hanh chinh
nhan trong » nhuan trong, nhat trong, nhin trong
hoc khien » hoc hien, hoc nghien, hoc thieu
trinh cua » tinh cua, trinh luat, trinh quan
trong dan » trong dang, trong san, trong tan
cua nhan » ca nhan, cua ngan, cua nha
than tap » toan tap, han tap, than cap
phan tap » phan lap, han tap, pha tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc khien bang - hanh trinh cua nhan trong dan ((than tap) or (phan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc khien bang - hanh trinh cua nhan trong dan ((than tap) OR (phan tap))*.