Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh dai » thanh hai, thanh tai, thanh dat
vu khach » vu khanh, vu khac, vay khach
vuc nang » cuc nang, vu nang, chuc nang
vu sach » vu bach, su sach
nang ho » nang hoc, nang co, tang ho
hieu va » lieu va, hieu qua
cac cac » cac cach, ca cac, cac bac
cac van » cac dan
cua tre » cua te, cuu tre, cua triet
ho hoi » hoc hoi, hoa hoi, hoi hoi

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) OR (vu khach)) vuc nang ho hoi. hieu va cac cac van thanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) vuc nang ho hoi. hieu va cac cac van thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) vuc nang ho hoi. hieu va cac cac van thanh dai cua tre*.