Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
qua nhan » cua nhan, qua nhat, qua phan
nhan duc » nhan duoc, nhan luc, phan duc
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
so sach » so sanh, bo sach, co sach
vu sach » su sach, vu khach
mai hoi » mai khoi, dai hoi, lai hoi
duc van » duc va, duc tan, duc manh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (((vu sach) OR (vu bach)))) y nang mai hoi. hieu qua nhan duc van hanh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (((vu sach) OR (vu bach)))) y nang mai hoi. hieu qua nhan duc van hanh doi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (((vu sach) OR (vu bach)))) y nang mai hoi. hieu qua nhan duc van hanh doi cua tre*.