Perhaps you should try some spelling variations:
hanh hoi » hanh thoi, hanh noi, hanh hoa
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
hoi cua » hoi chuc
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
sach ty » sach y, xach tay, sach hay
sach tu » cach tu, sach uu, sach xu
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: te ((sach ty) or (((sach tu) OR (sach thu)))) lang xa hoi. hieu qua cac vuc van hanh hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (((sach tu) OR (sach thu)))) lang xa hoi. hieu qua cac vuc van hanh hoi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (((sach tu) OR (sach thu)))) lang xa hoi. hieu qua cac vuc van hanh hoi cua te".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (((sach tu) OR (sach thu)))) lang xa hoi. hieu qua cac vuc van hanh hoi cua te*.