Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
ky sang » ky dang, ky tang, duy sang
dai hoi » dai hoc, dai hai, dai moi
hieu tu » chieu tu, hieu tuc, hien tu
tu cham » toc cham, thi cham
soc van » hoc van, oc van, sac van
cua tuc » cua duc, cua thuoc, luat tuc
tu sac » tu sach, tu cac, tu san
cua tu » cua su, cua cu, cua te

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