Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
danh vai » danh sai, danh va, doanh van
van cam » van nam, van lam, van cau
vai cua » dai cua, hai cua, lai cua
xuc va » tuc va, luc va, xac va

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 ((thu nang) or (thu hang)) xa hoi. hieu van cam ((xuc va) OR (duc va)) danh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((thu nang) OR (thu hang)) xa hoi. hieu van cam ((xuc va) OR (duc va)) danh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((thu nang) or (thu hang)) xa hoi. hieu van cam ((xuc va) OR (duc va)) danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((thu nang) or (thu hang)) xa hoi. hieu van cam ((xuc va) OR (duc va)) danh vai cua triet*.