Perhaps you should try some spelling variations:
te sach » toc sach
lua tre » cua tre, luy tre, dua tren
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va lua » va luat, ca lua, vi lua
ve cap » le cap, ve cai, ve cau
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: te sach y nang ((x hoi) or (o hoi)). hieu ((ve cap) OR (ve cac)) nuoc va dan va lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((x hoi) OR (o hoi)). hieu ((ve cap) OR (ve cac)) nuoc va dan va lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((x hoi) or (o hoi)). hieu ((ve cap) OR (ve cac)) nuoc va dan va lua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) or (o hoi)). hieu ((ve cap) OR (ve cac)) nuoc va dan va lua tre*.