Perhaps you should try some spelling variations:
hoc viet » hoc hien
sach chu » sach che, sach thu, sach thue
chu bang » thu bang, chuc nang, chu quang
bang may » mang may, ban may, bang tay
lang voi » lanh voi, khang voi, lang cuoi
va lang » va nang, hoa lang
te sach » toc sach
may hoi » may thoi, tay hoi, mai hoi
ve daut » ve dat
xuc va » duc va, tuc va, luc va
ve dau » va dau, ve du, ke dau

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 chu bang may hoi. hieu ((ve dau) or (ve daut)) xuc va lang voi ((so viet) OR (hoc viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach chu bang may hoi. hieu ((ve dau) OR (ve daut)) xuc va lang voi ((so viet) OR (hoc viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach chu bang may hoi. hieu ((ve dau) or (ve daut)) xuc va lang voi ((so viet) OR (hoc viet))".
• Adding a wildcard symbol may retrieve word variants: te sach chu bang may hoi. hieu ((ve dau) or (ve daut)) xuc va lang voi ((so viet) OR (hoc viet))*.