Perhaps you should try some spelling variations:
khanh trinh » thanh trinh, nhanh tinh, thanh tinh
trinh truoc » trinh truong, trinh thuc, trinh trung
hanh trinh » canh tranh, hanh chinh
truoc cac » truoc cach, truoc cang, truoc cuoc
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
trinh thi » trinh tai, dinh thi, trinh tu
cac khoa » cac khoi, dac khoa, cao khoa
khoa pho » khoa phu, khoa khoa, khoa phau
te hanh » te thanh, tu hanh, ve hanh
thi cac » thi cuc, tai cac, thi tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( duy khanh trinh truoc cac khoan pho thong ) or ( te hanh trinh thi cac khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( duy khanh trinh truoc cac khoan pho thong ) OR ( te hanh trinh thi cac khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( duy khanh trinh truoc cac khoan pho thong ) or ( te hanh trinh thi cac khoa pho thong ))*.