Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
dang xay » dang van, van xay
sach dao » lanh dao
tu sach » thu sach, su sach, te sach
luu van » cuu van, luan van, luu hanh
qua cac » cua cac
cac luu » cac luat, sach luu
lang xa » lang ha, lang van
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 sach dao ((lang xa) OR (dang xay)) hoi. hieu qua cac luu van ((hanh vai) or (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach dao ((lang xa) OR (dang xay)) hoi. hieu qua cac luu van ((hanh vai) OR (hanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach dao ((lang xa) OR (dang xay)) hoi. hieu qua cac luu van ((hanh vai) or (hanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach dao ((lang xa) OR (dang xay)) hoi. hieu qua cac luu van ((hanh vai) or (hanh tai)) cua te*.