Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van xanh » van anh, van hanh, van manh
te sach » toc sach
xanh di » danh di, vanh dai, xanh tai
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de 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 (thu sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam xuc van xanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam xuc van xanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam xuc van xanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam xuc van xanh di cua tre*.