Perhaps you should try some spelling variations:
than quoc » tran quoc, toan quoc, phan quoc
cua triet » cua viet, su triet, va triet
hang mai » hoang mai, hang tai, hang hai
mai khoi » mai khoa, tai khoa, cac khoi
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
vi cua » vai cua, di cua
gia » giao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty hang mai khoi. hieu qua ((than quoc) OR (han quoc)) gia thanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang mai khoi. hieu qua ((than quoc) OR (han quoc)) gia thanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang mai khoi. hieu qua ((than quoc) OR (han quoc)) gia thanh vi cua triet*.