Perhaps you should try some spelling variations:
dang tay » dang xay, dung tay, dan tay
luu tre » luu tru, cuu tre, luy tre
va hanh » van hanh, va thanh, va danh
va quan » van quan, tac quan, hai quan
va tuan » van tuan, va toan, a tuan
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
te sach » toc sach
soc va » hoc va, loc va, doc va
vi luu » vi lua
te sac » te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te sach)) ky dang tay hoi. hieu ((va tuan) or (va quan)) soc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky dang tay hoi. hieu ((va tuan) OR (va quan)) soc va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te sach)) ky dang tay hoi. hieu ((va tuan) or (va quan)) soc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te sach)) ky dang tay hoi. hieu ((va tuan) or (va quan)) soc va hanh vi luu tre*.