Perhaps you should try some spelling variations:
dat duoc » dat nuoc, da duoc, luat duoc
chat hoa » thuat hoa, chat huu, cau hoa
duoc van » duoc va, duc van, duoc ban
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va dat » va dao, va dau, va dap
anh va » hanh va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((cao hoi) or (((chat hoa) OR (chat va)))). hieu va dat duoc van anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((cao hoi) OR (((chat hoa) OR (chat va)))). hieu va dat duoc van anh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((cao hoi) or (((chat hoa) OR (chat va)))). hieu va dat duoc van anh va cua tre*".