Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
van cam » van nam, van lam, van cau
lanh ly » lanh lay, doanh ly, khanh ly
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
ly nang » ky nang, ly hang, ly vang
nang o » nang co, nang ho, nang ro
cam tu » cam thu, nam tu, dam tu
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: thuat lanh ly nang o hoi. hieu van cam tu va ((hanh di) or (hang di)) ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh ly nang o hoi. hieu van cam tu va ((hanh di) OR (hang di)) ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: thuat lanh ly nang o hoi. hieu van cam tu va ((hanh di) or (hang di)) ((cua triet) or (cua viet))*.