Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
dam thuc » am thuc, dan thuc, nam thuc
cam tuc » cam xuc, nam thuc, nam truc
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
cam tu » cam thu, nam tu, dam tu
cua tu » cua tuc, cua su, cua cu
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 (dam thuc))) or (cam tu)) gia thanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang o hai. hieu van ((((cam tuc) OR (dam thuc))) OR (cam tu)) gia thanh dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang o hai. hieu van ((((cam tuc) OR (dam thuc))) or (cam tu)) gia thanh dai cua tu".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang o hai. hieu van ((((cam tuc) OR (dam thuc))) or (cam tu)) gia thanh dai cua tu*.