Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
ve cai » va cai, ve tai, ve cau
ve cac » va cac, vien cac
ve su » va su

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 cai) or (ve cac)) duc va hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((ve cai) OR (ve cac)) duc va hanh ve su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((ve cai) or (ve cac)) duc va hanh ve su triet*.