Perhaps you should try some spelling variations:
dap phoi » cap phoi, gap phoi, dap phap
cua tre » cuu tre, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
lang ky » dang ky, bang ky, lang ke
hieu ve » hieu va, hieu van
tang ky » dang ky, trong ky, tang khu
va dap » va dao, va dau
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((lang ky) OR (tang ky)) va dap phoi. hieu ve cam tu va danh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((lang ky) OR (tang ky)) va dap phoi. hieu ve cam tu va danh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((lang ky) OR (tang ky)) va dap phoi. hieu ve cam tu va danh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu ((lang ky) OR (tang ky)) va dap phoi. hieu ve cam tu va danh vi ((cua tre) or (cua te))*.