Perhaps you should try some spelling variations:
thanh sinh » thanh binh, thanh tinh, thanh vinh
tu sach » thu sach, su sach, te sach
quan va » quan vi, quan ha, quan ve
luan va » luan van, luat va
sinh va » sinh vat, tinh va, dinh van
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
va nam » van nam, ha nam, va nay
va tre » va trien
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: tu sach y nang o hoi. lieu va nam ((quan va) or (luan va)) thanh sinh va tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. lieu va nam ((quan va) OR (luan va)) thanh sinh va tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. lieu va nam ((quan va) or (luan va)) thanh sinh va tre*.