Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dai » danh dau, danh di, danh sai
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ty hang » ly hang, ty xang, thi hang
van cau » van dau, van hau, van chat
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
ty nang » ky nang, ty xang, ly nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty nang) OR (ty hang)) xa hoi. hieu van cau ((truc va) or (thuc va)) danh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty hang)) xa hoi. hieu van cau ((truc va) OR (thuc va)) danh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ty hang)) xa hoi. hieu van cau ((truc va) or (thuc va)) danh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) OR (ty hang)) xa hoi. hieu van cau ((truc va) or (thuc va)) danh dai cua triet*.