Perhaps you should try some spelling variations:
hieu viet » sieu viet, hieu viec, lieu viet
viet sach » viet anh, dien sach, viet tech
sach luoc » sach duoc, sach nuoc, sach luan
van hanh » van thanh, ban hanh, van anh
nang dai » nang dau, nang tai, lang dai
can hanh » ban hanh, dan hanh, dang hanh
dai moi » doi moi, dai hoi
vi cua » vai cua, di cua
tu bai » tu ban, te bai
tu bat » tu ban, tu dat
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu bai) or (tu bat)) ky nang dai moi. hieu viet sach luoc ((can hanh) OR (van hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bai) OR (tu bat)) ky nang dai moi. hieu viet sach luoc ((can hanh) OR (van hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu bai) or (tu bat)) ky nang dai moi. hieu viet sach luoc ((can hanh) OR (van hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu bai) or (tu bat)) ky nang dai moi. hieu viet sach luoc ((can hanh) OR (van hanh)) vi cua te*.