Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
qua nhan » cua nhan, qua nhat, qua phan
doi cua » dai cua, hoi cua
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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: su sach ((ky nang) OR (ki nang)) ma hoi. hieu qua nhan ((luc va) OR (tuc va)) hanh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky nang) or (ki nang)) ma hoi. hieu qua nhan ((luc va) OR (tuc va)) hanh doi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky nang) or (ki nang)) ma hoi. hieu qua nhan ((luc va) OR (tuc va)) hanh doi cua tre*.