Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
danh vi » hanh vi, dinh vi, danh di
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
va tham » van tham, va cham, va thanh
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) ky dang xay hoi. hieu va tham ((xuc va) OR (luc va)) danh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky dang xay hoi. hieu va tham ((xuc va) OR (luc va)) danh vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky dang xay hoi. hieu va tham ((xuc va) OR (luc va)) danh vi va triet*".