Perhaps you should try some spelling variations:
khien dong » nhiet dong, dien dong, bien dong
hoc khien » hoc hien, hoc nghien, hoc thieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
han trong » hanh trong, nhan trong, phan trong
trong san » trong cac, cong san, dong san
tinh cua » trinh cua, sinh cua, tinh chat
than cap » khan cap, thanh lap, thanh cac
phan tap » phan lap, han tap, pha tap
cua han » cua hang, cua nhan, cua phan

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 dong - hanh tinh cua han trong san ((than cap) or (phan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc khien dong - hanh tinh cua han trong san ((than cap) OR (phan tap))*.