Perhaps you should try some spelling variations:
bieu thien » bieu hien, dieu khien, bien phien
thien cac » hien cac, thien cau, thieu cac
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
bao va » bao ve, tao va, ban va
co va » co ma, so va, cu va
do va » do van, so va

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 ky nang xa hoi. bieu thien cac ((((bao va) or (co va))) or (do va)) danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. bieu thien cac ((((bao va) OR (co va))) OR (do va)) danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. bieu thien cac ((((bao va) or (co va))) or (do va)) danh vai cua tre*.