Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
hieu su » hieu sau, tieu su, hieu so
te sach » toc sach
lai roi » lai hoi, loi roi
su chao » su cao, sau chan
dan vi » doan vi, dan va, gan vi
tu sac » tu sach, tu cac, tu san
cua te » cua tu
xu va » xu van, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (te sach)) ky nang lai roi. hieu su chao xu va ((dan vi) OR (don vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (te sach)) ky nang lai roi. hieu su chao xu va ((dan vi) OR (don vi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (te sach)) ky nang lai roi. hieu su chao xu va ((dan vi) OR (don vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (te sach)) ky nang lai roi. hieu su chao xu va ((dan vi) OR (don vi)) cua te*.