Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
thu hanh » thuc hanh, thu thanh, thuy hanh
doanh va » doan va, doanh tai, doanh cua
ta thanh » tai thanh, va thanh, ha thanh
trinh ly » trinh ky, trinh do, sinh ly
trinh tu » trinh ky, trinh do
va kha » va khao, va khi

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 doanh va kha đong luc ) or ( ta thanh ((trinh ly) or (trinh tu)) chi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hanh doanh va kha đong luc ) OR ( ta thanh ((trinh ly) OR (trinh tu)) chi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( thu hanh doanh va kha đong luc ) or ( ta thanh ((trinh ly) or (trinh tu)) chi đong luc ))*.