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

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