Perhaps you should try some spelling variations:
sach tham » sach nha
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van ban
sang ma » tang ma, nang ma, sang tao
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
van anh » van thanh, tuan anh, van minh
thiet* » thieu*

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 tham ((sang ma) or (nang x)) hoi. hieu vu cham duc ((van hanh) OR (van anh)) mai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tham ((sang ma) OR (nang x)) hoi. hieu vu cham duc ((van hanh) OR (van anh)) mai va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tham ((sang ma) or (nang x)) hoi. hieu vu cham duc ((van hanh) OR (van anh)) mai va thiet*".