Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hanh vien » thanh vien, hanh kien, thanh nien
luoc gia » quoc gia, luc gia, luong gia
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
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: tu sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) luoc gia ((hanh vi) or (hanh vien)) cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) luoc gia ((hanh vi) OR (hanh vien)) cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) luoc gia ((hanh vi) or (hanh vien)) cau triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) luoc gia ((hanh vi) or (hanh vien)) cau triet*.