Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
va triet » va trien, ve triet, cua triet
hang tai » hang va, dung tai
van hang » van khang, van hoang, van thang
duc van » duc va, duc tan, duc manh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang ma » tang ma, sang ma, nang cao
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 nha ((nang ma) or (nang x)) hoi. hieu vu cham duc van hang tai ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach nha ((nang ma) OR (nang x)) hoi. hieu vu cham duc van hang tai ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach nha ((nang ma) or (nang x)) hoi. hieu vu cham duc van hang tai ((va triet) OR (va thiet))*".