Perhaps you should try some spelling variations:
khoan phan » khoan phai, khoan thanh, hoa phan
hanh trinh » hanh chinh
phan thong » phan thuong, phan hong, phan tong
trinh han » trinh quan
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
thu hanh » thuc hanh, thu thanh, thuy hanh
tranh tu » trinh tu, tran tu, thanh tu
han cac » phan cac, hang cac, hanh cac
tu canh » thu canh, tu chanh, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hanh trinh han cac khoan pho thong ) or ( tu canh tranh tu cac khoan phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hanh trinh han cac khoan pho thong ) OR ( tu canh tranh tu cac khoan phan thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hanh trinh han cac khoan pho thong ) or ( tu canh tranh tu cac khoan phan thong ))*.