Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
su triet » su viet, su tien, ve triet
toc sach » hoc sach, doc sach, thuoc sach
duc ban » duc tan, duc van, dua ban
xuc ban » cuc ban, quoc ban, xuat ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
van su » dan su
ve cac » va cac, vien cac

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 (toc sach)) ky sang xa hoi. hieu ve cac ((xuc ban) OR (duc ban)) thanh van su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky sang xa hoi. hieu ve cac ((xuc ban) OR (duc ban)) thanh van su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky sang xa hoi. hieu ve cac ((xuc ban) OR (duc ban)) thanh van su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky sang xa hoi. hieu ve cac ((xuc ban) OR (duc ban)) thanh van su triet*.