Perhaps you should try some spelling variations:
pham duy » pham duc
vien cua » viec cua, dien cua, tien cua
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » thu sach, su sach, te sach
mai hoi » lai hoi, mai doi, mai hoa
va nhan » van nhan, ca nhan, va phan
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
hieu vi » hieu voi, hieu va, hieu ve
duy va » duy vat, duy van, day va
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 ky nang ((((mai hoi) OR (mai khoi))) or (dai hoi)). hieu vi pham duy va nhan vien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((mai hoi) OR (mai khoi))) OR (dai hoi)). hieu vi pham duy va nhan vien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((((mai hoi) OR (mai khoi))) or (dai hoi)). hieu vi pham duy va nhan vien cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((mai hoi) OR (mai khoi))) or (dai hoi)). hieu vi pham duy va nhan vien cua te*.