Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc 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) or (so sach)) ky nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sach)) ky nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc va thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (so sach)) ky nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc va thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc va thanh va cua tre*.