Perhaps you should try some spelling variations:
thien van » thi van
nuoc sach » nguoi sach, hoc sach, cuoc cach
thu sach » tu sach, thuat sach, thuoc sach
lam duc » lam duoc, pham duc, nam duoc
luu tre » luu tru, cuu tre, luy tre
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
va don » va dong, va doc, va do
vi luu » vi lua
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: ((thu sach) or (nuoc sach)) y nang o hoi. ((lieu va) or (thien van)) lam duc va don vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (nuoc sach)) y nang o hoi. ((lieu va) OR (thien van)) lam duc va don vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (nuoc sach)) y nang o hoi. ((lieu va) or (thien van)) lam duc va don vi luu tre*.