Perhaps you should try some spelling variations:
thieu nien » thien nhien
dieu hien » dieu khien, dieu kien, bieu hien
tu sach » thu sach, su sach, te sach
dan vat » dang vat, van vat, dan va
dan vai » dan va, dan tai, den vai
bach tu » bach thu, cach tu, bac tu
tu cua » hu cua, vu cua
y nang » ky nang, ly nang, v nang
cua te » cua tu
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 y nang x hoi. ((dieu hien) or (thieu nien)) bach tu cua ((dan vai) OR (dan vat)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((dieu hien) OR (thieu nien)) bach tu cua ((dan vai) OR (dan vat)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((dieu hien) or (thieu nien)) bach tu cua ((dan vai) OR (dan vat)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((dieu hien) or (thieu nien)) bach tu cua ((dan vai) OR (dan vat)) cua te*.