Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sang ma » tang ma, sang tao, sang tai
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, nang cao
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((((nang ma) OR (mang may))) or (sang ma)) hoi. hieu ve cam luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((((nang ma) OR (mang may))) OR (sang ma)) hoi. hieu ve cam luc va hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((((nang ma) OR (mang may))) or (sang ma)) hoi. hieu ve cam luc va hanh vi cua tre*".