Perhaps you should try some spelling variations:
khanh trien » khanh truyen, khanh chien, thanh tien
khanh tieu » thanh thieu, hang tieu, thanh tien
trien qua » trien cua, trien quy, trien quang
chuan hoa » chuan ha, chuan doan, khuan khoa
vu khanh » vu thanh, van khanh, duy khanh
qua khoa » sua khoa, qua kho, chua khoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu khanh trien qua khoa hoc ) or ( vu khanh tieu chuan hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu khanh trien qua khoa hoc ) OR ( vu khanh tieu chuan hoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (( vu khanh trien qua khoa hoc ) or ( vu khanh tieu chuan hoa hoc ))*.