Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
thi nang » thi cong, ki nang, thi hanh
tra nang » kha nang, da nang, va nang
cuc ban » cua ban, cac ban, cuu ban
cau cuc » cau cua, cau luc, cau truc
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, te sach
tu nang » tru nang, tu nong, tu nano
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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 ((tu nang) or (((thi nang) or (tra nang)))) xa hoi. hieu van cau cuc ban thanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (((thi nang) OR (tra nang)))) xa hoi. hieu van cau cuc ban thanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (((thi nang) or (tra nang)))) xa hoi. hieu van cau cuc ban thanh vi luu tre*.