Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, nam thuc, dam thuc
vu sac » vu sach, vu san, va sac
cua tu » cua tuc, cua cu, cua te
cua su » qua su
cam tu » cam thu, nam tu, dam tu
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 ky nang o hai. hieu van ((cam tuc) or (cam tu)) gia thanh hai ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang o hai. hieu van ((cam tuc) OR (cam tu)) gia thanh hai ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang o hai. hieu van ((cam tuc) or (cam tu)) gia thanh hai ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang o hai. hieu van ((cam tuc) or (cam tu)) gia thanh hai ((cua tu) OR (cua su))*.