Perhaps you should try some spelling variations:
trinh hu » trinh chu, trinh tu, trinh he
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va nam » van nam, ha nam
va nay » va ngay, va cay
tu lap » truc lap
hu cua » tu cua, vu cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu ((va nam) OR (va nay)) tu lap trinh hu cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. hieu ((va nam) or (va nay)) tu lap trinh hu cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. hieu ((va nam) or (va nay)) tu lap trinh hu cua viet*.