Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
thi hang » thi hanh, thi nang, thi hong
ty hang » ly hang, ty xang, thu hang
hieu va » lieu va, hieu qua
danh te » danh tu, danh het, danh yen
xuc va » tuc va, luc va, xac va
te cua » tue cua, le cua, de cua

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

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