Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
lanh ly » lanh lay, doanh ly, khanh ly
ly nang » ky nang, ly hang, ly vang
van cam » van nam, van lam, van cau
cam tu » cam thu, nam tu, dam tu
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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) OR (o hai)). hieu van cam tu va ((hanh di) or (hang di)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh ly nang ((o hoi) OR (o hai)). hieu van cam tu va ((hanh di) OR (hang di)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat lanh ly nang ((o hoi) OR (o hai)). hieu van cam tu va ((hanh di) or (hang di)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat lanh ly nang ((o hoi) OR (o hai)). hieu van cam tu va ((hanh di) or (hang di)) cua triet*.