Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
cay phoi » cap phoi, cay cho, gap phoi
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
luu tre » luu tru, cuu tre, luy tre
soc va » hoc va, loc va, doc va
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: te sach ky dang ((cay phoi) or (tay hoi)). hieu ((van thanh) OR (ban thanh)) soc va danh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((cay phoi) OR (tay hoi)). hieu ((van thanh) OR (ban thanh)) soc va danh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((cay phoi) or (tay hoi)). hieu ((van thanh) OR (ban thanh)) soc va danh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ((cay phoi) or (tay hoi)). hieu ((van thanh) OR (ban thanh)) soc va danh vi luu tre*.