Perhaps you should try some spelling variations:
dang mai » dang hai, dang mau, dang bai
mai khoi » mai khoa, tai khoa, cac khoi
hieu va » lieu va, hieu qua
cac ban » cac dan, cac van, can ban
ky dang » ky nang, ky danh
cuc ban » cua ban, cuu ban, duc ban
va chat » van chat, va phat, cao chat
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu bac
tu san » thu san, tu ban, tu can
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 sac) or (tu san)) ky dang mai khoi. hieu va chat ((cuc ban) OR (cac ban)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky dang mai khoi. hieu va chat ((cuc ban) OR (cac ban)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu san)) ky dang mai khoi. hieu va chat ((cuc ban) OR (cac ban)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky dang mai khoi. hieu va chat ((cuc ban) OR (cac ban)) hanh vi cua te*.