Perhaps you should try some spelling variations:
trinh vang » trinh van, trinh bang, trinh mang
qua trinh » qua kinh
cua viet » ca viet, hoa viet, cua vat
vang cua » mang cua, hang cua, tang cua
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
co sach » bo sach, cuon sach, hoc sach
va nay » va ngay, va cay
tu qua » tu quan, tu cua, tu quy
va nam » van nam, ha nam
x hoi » xa hoi, o hoi, x ho

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 (co sach)) ty nang x hoi. hieu ((va nam) or (va nay)) tu qua trinh vang cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ty nang x hoi. hieu ((va nam) OR (va nay)) tu qua trinh vang cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ty nang x hoi. hieu ((va nam) or (va nay)) tu qua trinh vang cua viet*.