Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
tham duc » pham duc, tham du, than duc
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
va tham » van tham, va cham, va thanh
va danh » va dinh, va dan, va hanh
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach thu ((nang ma) or (nang x)) hoi. lieu va tham duc ((va danh) or (ban thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thu ((nang ma) OR (nang x)) hoi. lieu va tham duc ((va danh) OR (ban thanh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach thu ((nang ma) or (nang x)) hoi. lieu va tham duc ((va danh) or (ban thanh)) vi su triet*.