Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
ban huong » bang phuong, ban hang, anh huong
san huong » san thuong, van huong, lan huong
su sach » so sach, vu sach
doi cuu » doi cua, doi cuoc
ve nham » ve nha, ve cham
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
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 nham thuc ((san huong) OR (ban huong)) 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 nham thuc ((san huong) OR (ban huong)) 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 nham thuc ((san huong) OR (ban huong)) doi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((x hoi) or (o hoi)). hieu ve nham thuc ((san huong) OR (ban huong)) doi cuu tre*.