Perhaps you should try some spelling variations:
lang mai » lang dai, lang hai, lang man
quoc ban » quoc bao, quoc lan, quoc quan
ky lang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va
cuc ban » cua ban, cac ban, cuu ban
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: tu cac ky lang mai hoi. ((hieu va) OR (hieu qua)) phat ((cuc ban) or (quoc ban)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky lang mai hoi. ((hieu va) OR (hieu qua)) phat ((cuc ban) OR (quoc ban)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky lang mai hoi. ((hieu va) OR (hieu qua)) phat ((cuc ban) or (quoc ban)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu cac ky lang mai hoi. ((hieu va) OR (hieu qua)) phat ((cuc ban) or (quoc ban)) hanh vi cua te*.