Perhaps you should try some spelling variations:
thanh may » thanh tay, hanh may, thanh mau
doc sach » hoc sach, toc sach, nuoc sach
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
hieu va » lieu va, hieu qua
may cua » day cua, may bua, may sua
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang

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