Perhaps you should try some spelling variations:
hanh cac » hang cac, hanh cat, nhanh cay
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
cac cua » cach cua, cac qua, ca cua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((su sach) or (bo sach))) or (toc sach)) ky nang ma hoi. hieu va cam tuc va hanh cac cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (bo sach))) OR (toc sach)) ky nang ma hoi. hieu va cam tuc va hanh cac cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((su sach) or (bo sach))) or (toc sach)) ky nang ma hoi. hieu va cam tuc va hanh cac cua tre*.