Perhaps you should try some spelling variations:
thanh soc » thanh son, nhanh soc, thanh hoc
hieu van » thien van, lieu va, hieu ve
cay phoi » cap phoi, cay cho, gap phoi
hieu va » lieu va, hieu qua
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) OR (hieu va)) 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) OR (hieu va)) 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) OR (hieu va)) 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) OR (hieu va)) thanh soc va danh vi luu tre*.