Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
luu tre » luu tru, cuu tre, luy tre
ve cac » va cac, vien cac
luc va » tuc va, loc va
vi luu » vi lua

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

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