Perhaps you should try some spelling variations:
dua tren » dung tren
cai nuoc » cap nuoc, cac nuoc, cuoi nuoc
hieu ve » hieu va, hieu van
te sach » toc sach
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cai » va cai, ve cac, ve tai
va dao » ca dao
dao vi » dao voi, dao ve, dao va
vi dua » vi du, vi dum, vi lua
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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) or (v nang)) ((x hoi) or (o hoi)). hieu ve cai nuoc va dao vi dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) ((x hoi) OR (o hoi)). hieu ve cai nuoc va dao vi dua tren.
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) ((x hoi) or (o hoi)). hieu ve cai nuoc va dao vi dua tren*.