Perhaps you should try some spelling variations:
tien khi » trien khai
hoc tien » hoc tieng, hoc hien, hoc vien
nhung co » nhung con, nhung bo, khung co
chung co » chung cho, chung cu, chong co
hoi hoc » hoa hoc, khoa hoc, hoi chuc
khi cua » chi cua, thai cua
doi vi » doi voi, doi vai, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) OR (tu cac)) hoi hoc tien khi cua ets : ((nhung co) or (chung co)) doi vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (tu cac)) hoi hoc tien khi cua ets : ((nhung co) OR (chung co)) doi vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) OR (tu cac)) hoi hoc tien khi cua ets : ((nhung co) or (chung co)) doi vi đai".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) OR (tu cac)) hoi hoc tien khi cua ets : ((nhung co) or (chung co)) doi vi đai*.