Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
hanh tue » hanh tuyen, hanh theo, hanh tiet
hanh tu » anh tu, danh tu
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
cu thuc » cuu thuc, co thuc, cu thu
nang xa » nang x, lang xa, nang ma
cua tuc » cua duc, cua thuoc, luat tuc
van cu » van cau, van chu, van cua
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 sach ky nang xa hoi. hieu van cu thuc dan ((hanh tue) OR (hanh tu)) ((cua tu) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van cu thuc dan ((hanh tue) OR (hanh tu)) ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van cu thuc dan ((hanh tue) OR (hanh tu)) ((cua tu) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van cu thuc dan ((hanh tue) OR (hanh tu)) ((cua tu) or (cua tuc))*.