Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
qua tham » qua cham, qua than, qua thanh
tham duc » pham duc, tham du, than duc
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
duc ban » duc tan, duc van, dua ban
ha hoi » hoa hoi, ha noi, xa hoi
va cua » va chua, via cua, ca cua
co cua » con cua, ca cua, cong cua

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 (thu hoach)) ky lang ha hoi. hieu qua tham duc ban thanh ((va cua) or (co cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky lang ha hoi. hieu qua tham duc ban thanh ((va cua) OR (co cua)) triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky lang ha hoi. hieu qua tham duc ban thanh ((va cua) or (co cua)) triet*.