Perhaps you should try some spelling variations:
chua thuc » thuat thuc, chuan chuc, thuan thuc
hanh tue » hanh tu, hanh tuyen, hanh theo
hieu van » hieu va, thien van, lieu va
dan hanh » dang hanh, dan khanh, dan thanh
cua thuc » cua thuoc, qua thuc, rua thuc
tu sach » thu sach, su sach, te sach
cua tuc » cua duc, cua thuoc, luat tuc
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
cua tu » cua su, cua cu, cua te
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu van ((cua thuc) or (chua thuc)) dan hanh tue ((cua tu) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu van ((cua thuc) OR (chua thuc)) dan hanh tue ((cua tu) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu van ((cua thuc) or (chua thuc)) dan hanh tue ((cua tu) or (cua tuc))*.