Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
ky dang » ky nang
ky danh » ky anh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
tuc va » thuc va, truc va, tuc xa

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 dang) OR (ky danh)) xay hoi. hieu va cac tuc va hanh tai ((cuc tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky dang) OR (ky danh)) xay hoi. hieu va cac tuc va hanh tai ((cuc tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky dang) OR (ky danh)) xay hoi. hieu va cac tuc va hanh tai ((cuc tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) OR (ky danh)) xay hoi. hieu va cac tuc va hanh tai ((cuc tre) or (cua tre))*.