Perhaps you should try some spelling variations:
ban hanh » ban hang
nang dai » nang dau, nang tai, lang dai
xang dau » hang dau
cam luoc » cam xuc, tom luoc, cam lo
van hanh » van thanh, van anh, van ban
su sach » so sach, vu sach
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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 ky ((nang dai) or (xang dau)) hoi. hieu ve cam luoc ((van hanh) OR (ban hanh)) hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang dai) OR (xang dau)) hoi. hieu ve cam luoc ((van hanh) OR (ban hanh)) hai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang dai) or (xang dau)) hoi. hieu ve cam luoc ((van hanh) OR (ban hanh)) hai cua te*".