Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
va cam » va cham, va cac, va cao
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((lang xa) or (nang x)) hoi. hieu va cam duc ban thanh vi luu (tru or truc)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (nang x)) hoi. hieu va cam duc ban thanh vi luu (tru OR truc).
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (nang x)) hoi. hieu va cam duc ban thanh vi luu (tru or truc)*.