Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
viec cac » vien cac, viec cua, viec lam
dang xay » dang van, van xay
tu sach » su sach, te sach, tu cach
vai cuu » vai cua
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
cac co » cac cong
co van » cao van, vo van, so van

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 (thu sach)) ky ((nang xa) or (dang xay)) hoi. hieu viec cac co van hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky ((nang xa) OR (dang xay)) hoi. hieu viec cac co van hanh vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky ((nang xa) or (dang xay)) hoi. hieu viec cac co van hanh vai cuu tre*".