Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xanh doi » xanh di, thanh doi, tinh doi
te sach » toc sach
doi cua » dai cua, hoi cua
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa

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 cam ((xuc van) OR (luc van)) xanh doi 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 cam ((xuc van) OR (luc van)) xanh doi 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 cam ((xuc van) OR (luc van)) xanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky sang ma hoi. hieu ve cam ((xuc van) OR (luc van)) xanh doi cua tre*.