Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
vu khach » vu khanh, vu khac, vay khach
thanh ha » thanh hoa, nhanh ha, thanh phan
vu sach » vu bach, su sach
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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)) ky lang xa hoi. hieu va cac duc va ((thanh ha) OR (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky lang xa hoi. hieu va cac duc va ((thanh ha) OR (thanh hai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ky lang xa hoi. hieu va cac duc va ((thanh ha) OR (thanh hai)) cua tre*".