Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
van hanh » van thanh, ban hanh, van anh
ve cham » va cham, ve chat, vu cham
hanh ve » hanh vi, hanh va, hanh kem
xuc van » duc van, luc van, vuc van
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
ve cam » ve cac, va cam, ve cai
ve cau » ke cau, va cau, ve cac

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 (su sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cham)) xuc van hanh ve cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cham)) xuc van hanh ve cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cham)) xuc van hanh ve cau theo".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cham)) xuc van hanh ve cau theo*.