Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
cac luoc » cac nuoc, cac cuoc, cac quoc
lang xa » lang ha, dang xay, lang van
luoc va » nuoc va, duoc va, loc va
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sac ky » sai ky
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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 ky) or (cac ky)) lang xa hoi. hieu cua cac luoc va hanh di ((cua tu) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) lang xa hoi. hieu cua cac luoc va hanh di ((cua tu) OR (cua cu)).
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (cac ky)) lang xa hoi. hieu cua cac luoc va hanh di ((cua tu) or (cua cu))*.