Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
vu khach » vu khanh, vu khac, vay khach
thanh vi » hanh vi, thanh va, thanh ve
tu nang » tru nang, tu nong, tu nano
qua hai » qua hoat
hai luc » hai cuc, khai luoc, nhan luc
luc van » luoc van, luu van, duc van
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ((((tu nang) or (tu dong))) or (truc nano)) xa hoi. hieu qua hai luc van thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((((tu nang) OR (tu dong))) OR (truc nano)) xa hoi. hieu qua hai luc van thanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu khach ((((tu nang) or (tu dong))) or (truc nano)) xa hoi. hieu qua hai luc van thanh vi cuu tre*.