Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
van bao » van ban, van dao
bao luc » bao thuc
luc tan » luc tai, duc tan, luc tam
van cua » vang cua, ban cua, nan cua
dan cua » dan ca, ban cua, dai cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang x hoi. hieu van bao luc tan thanh ((van cua) or (dan cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x hoi. hieu van bao luc tan thanh ((van cua) OR (dan cua)) viet.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x hoi. hieu van bao luc tan thanh ((van cua) or (dan cua)) viet*.