Perhaps you should try some spelling variations:
huong doi » huong dan, dung doi
cham tuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
tuc sat » tuc hat, tuc tat, thuc san
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 nang ((x hoi) or (o hoi)). hieu ve cham tuc sat ((huong doi) OR (trong doi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((x hoi) OR (o hoi)). hieu ve cham tuc sat ((huong doi) OR (trong doi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((x hoi) or (o hoi)). hieu ve cham tuc sat ((huong doi) OR (trong doi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((x hoi) or (o hoi)). hieu ve cham tuc sat ((huong doi) OR (trong doi)) cuu tre*.