Perhaps you should try some spelling variations:
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
luu tre » luu tru, cuu tre
luy tre » luyen tre
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
tac va » tac da, tac xa, tuc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky nang xa hoi. hieu ve cac tac va danh vi ((luu tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky nang xa hoi. hieu ve cac tac va danh vi ((luu tre) OR (luy tre)).
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang xa hoi. hieu ve cac tac va danh vi ((luu tre) or (luy tre))*.