Perhaps you should try some spelling variations:
trinh ban » trinh han, trinh san, trinh dan
quy trinh » qua trinh, quy dinh
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
ban cua » ban quan
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
va nay » va ngay, va cay
tu quy » tu duy, tu quynh
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 (thu sach)) ty nang x hoi. hieu ((va nam) or (va nay)) tu quy trinh ban cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ((va nam) OR (va nay)) tu quy trinh ban cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang x hoi. hieu ((va nam) or (va nay)) tu quy trinh ban cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ((va nam) or (va nay)) tu quy trinh ban cua viet*.