Perhaps you should try some spelling variations:
chat quoc » chuan quoc, thuat quoc, han quoc
nang mai » nang ma, nang tai, lang mai
quoc oai » quoc hoi
oai hanh » oai thanh, hoai thanh, tai thanh
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua te » cua tu
cua su » qua 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 nang mai hoi. hieu va chat quoc oai hanh vi ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang mai hoi. hieu va chat quoc oai hanh vi ((cua te) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang mai hoi. hieu va chat quoc oai hanh vi ((cua te) or (cua su))*.