Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dung sai » dung tai, dung va, dung dat
danh sai » danh bat, danh dau, hanh san
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
y xang » ty xang
xang x » nang x
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y xang x hoi. hieu ((ve cham) or (va cham)) thuc va ((danh sai) OR (dung sai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y xang x hoi. hieu ((ve cham) OR (va cham)) thuc va ((danh sai) OR (dung sai)) cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y xang x hoi. hieu ((ve cham) or (va cham)) thuc va ((danh sai) OR (dung sai)) cau tren*".