Perhaps you should try some spelling variations:
hoang van » hang va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
soc van » hoc van, oc van, sac van
va tham » van tham, va thanh, va thuat
va cham » va chat
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
vi luu » vi lua
tru* » truc*

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 ty ((lang xa) or (hoang van)) hoi. hieu ((va cham) OR (va tham)) soc van hanh vi luu tru~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (hoang van)) hoi. hieu ((va cham) OR (va tham)) soc van hanh vi luu tru*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((lang xa) or (hoang van)) hoi. hieu ((va cham) OR (va tham)) soc van hanh vi luu tru*".