Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cao » qua cac, qua ca, qua cai
loc ban » lo ban, hoc ban, hoc bang
coc ban » cac ban, hoc ban, con ban
vu bac » vu bach, vu ban, xu bac
bac ky » cac ky, ban ky, sac ky
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bac ky lang xa hoi. hieu qua cao ((loc ban) or (((coc ban) or (co ban)))) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bac ky lang xa hoi. hieu qua cao ((loc ban) OR (((coc ban) OR (co ban)))) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: vu bac ky lang xa hoi. hieu qua cao ((loc ban) or (((coc ban) or (co ban)))) hanh vi cau tren*.