Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, tu cach, vu sach
te sach » toc sach
su sach » so sach, vu sach
dai moi » doi moi, dai hoi
hieu va » lieu va, hieu qua
va chao » va cao, va chat, va cham
xu van » tu van, vu van, su van
vai va » mai va, dai va, hai va
thiet » thieu

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 (te sach))) or (su sach)) ky nang dai moi. hieu va chao xu van hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (te sach))) OR (su sach)) ky nang dai moi. hieu va chao xu van hanh vai va thiet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (te sach))) or (su sach)) ky nang dai moi. hieu va chao xu van hanh vai va thiet*.