Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
luu tre » luu tru, cuu tre, luy tre
cao hoi » cau hoi, co hoi, cao hoc
xuc va » duc va, tuc va, luc va
vi luu » vi lua
ve cac » va cac

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) or (sach y)) nang cao hoi. hieu ((ve cac) OR (vien cac)) xuc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang cao hoi. hieu ((ve cac) OR (vien cac)) xuc va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang cao hoi. hieu ((ve cac) OR (vien cac)) xuc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang cao hoi. hieu ((ve cac) OR (vien cac)) xuc va hanh vi luu tre*.