Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
nang ma » tang ma, sang ma, nang cao
vu sac » vu sach, vu san, vu cac
va sac » va cac, va suc, va san
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, ha nam, va nay
he nam » ha nam, nghe nam
vi cua » vai cua, di cua
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: ((vu sac) OR (va sac)) ky nang ma hoi. hieu ((va nam) or (he nam)) hoc dan hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sac) OR (va sac)) ky nang ma hoi. hieu ((va nam) OR (he nam)) hoc dan hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sac) OR (va sac)) ky nang ma hoi. hieu ((va nam) or (he nam)) hoc dan hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sac) OR (va sac)) ky nang ma hoi. hieu ((va nam) or (he nam)) hoc dan hanh vi cua te*.