Perhaps you should try some spelling variations:
hieu sau » hieu su, hieu suat, tieu su
dang lai » dang loai, dung lai, dang bai
dang hai » dang khai, hang hai, dung hai
sau chao » sau cho, sau chan, cau cham
danh vi » hanh vi, dinh vi, danh di
xu van » tu van, vu van, su van
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
cua te » cua tu
xu va » tu va, su va, vu 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 san ky ((dang lai) or (dang hai)) hoi. hieu sau chao ((xu va) OR (xu van)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((dang lai) OR (dang hai)) hoi. hieu sau chao ((xu va) OR (xu van)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((dang lai) or (dang hai)) hoi. hieu sau chao ((xu va) OR (xu van)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((dang lai) or (dang hai)) hoi. hieu sau chao ((xu va) OR (xu van)) danh vi cua te*.