Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
thai cua » than cua, tai cuc, tri cua
tai cua » tai cuc, tri cua, dai cua
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van

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 tu ((tang ma) or (lang xa)) hoi. hieu va cham duc van thanh ((tai cua) OR (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu ((tang ma) OR (lang xa)) hoi. hieu va cham duc van thanh ((tai cua) OR (thai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu ((tang ma) or (lang xa)) hoi. hieu va cham duc van thanh ((tai cua) OR (thai cua)) tre*".