Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
van cam » van nam, van lam, van cau
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

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