Perhaps you should try some spelling variations:
thanh do » thanh pho, thanh hoa, thanh loi
thu sach » thuat sach, thuoc sach, thu hoach
nang dau » hang dau, xang dau, nang du
thanh de » hanh de, thanh ve, thanh le
tu sach » su sach, te sach, tu cach
cac duc » cac du, cao duc, cac dac
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
dau hoi » cau hoi, dai hoi, dan hoi
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac

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) OR (thu sach)) y nang dau hoi. hieu ve cac duc va ((thanh de) or (thanh do)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang dau hoi. hieu ve cac duc va ((thanh de) OR (thanh do)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang dau hoi. hieu ve cac duc va ((thanh de) or (thanh do)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang dau hoi. hieu ve cac duc va ((thanh de) or (thanh do)) cuu tre*.