Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky nang x hoi. ((hieu va) or (hieu qua)) pham duc va hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. ((hieu va) OR (hieu qua)) pham duc va hanh de cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. ((hieu va) or (hieu qua)) pham duc va hanh de cua te*.