Perhaps you should try some spelling variations:
qua phan » cua phan, qua than, quang phan
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
nang mai » nang ma, nang tai, lang mai
qua nhan » cua nhan, qua nhat, qua than
so sach » so sanh, bo sach, co sach
doi cua » dai cua, hoi cua
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
vu sach » vu bach, su sach, vu khach
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)) y nang mai hoi. hieu ((qua nhan) OR (qua phan)) luc van hanh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (vu sach)) y nang mai hoi. hieu ((qua nhan) OR (qua phan)) luc van hanh doi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu sach)) y nang mai hoi. hieu ((qua nhan) OR (qua phan)) luc van hanh doi cua tre*.