Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
te sach » toc sach
coc ban » co ban, cac ban, hoc ban
soc ban » hoc ban, so ban, soc ba
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
luu tre » luu tru, cuu tre, luy tre
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 ((mang may) or (lang van)) hoi. hieu va cham ((soc ban) OR (coc ban)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((mang may) OR (lang van)) hoi. hieu va cham ((soc ban) OR (coc ban)) hanh vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((mang may) or (lang van)) hoi. hieu va cham ((soc ban) OR (coc ban)) hanh vi luu tre*".