Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hanh phan » thanh phan, anh phan, hanh nhan
viec cac » vien cac, viec cua, viec lam
thu sach » thuat sach, thuoc sach, thu hoach
hanh han » hanh nhan, hanh san, anh han
cac luc » cau luc, coc luc, cac nuoc
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu viec cac luc va ((hanh phan) OR (hanh han)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang ma hoi. hieu viec cac luc va ((hanh phan) OR (hanh han)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoi. hieu viec cac luc va ((hanh phan) OR (hanh han)) cuu tre*.