Perhaps you should try some spelling variations:
trinh via » trinh va, trinh vi, trinh dia
vien cac » vien bach, vien da, gian cac
vien dai » hien dai
va trinh » van trinh, va tinh, lap trinh
via cua » gia cua, gian cua, giau cua
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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. nhieu ((vien cac) OR (vien dai)) duc va trinh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. nhieu ((vien cac) OR (vien dai)) duc va trinh via cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. nhieu ((vien cac) OR (vien dai)) duc va trinh via cua tre*".