Perhaps you should try some spelling variations:
khanh dinh » khanh linh, khanh vinh, hanh dinh
chuc tre » thuc tre, chuc theo, chuc thi
va khanh » van khanh, va thanh, vu khanh
tu sach » thu sach, su sach, te sach
cac hoc » cach hoc, cac hop, bac hoc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
tang xa » trang xa, lang xa, tang ha
thuc te » thuc tien
ve cac » va cac, vien cac

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 ((tang xa) or (tang ma)) hoi. hieu ve cac hoc va khanh dinh ((chuc tre) OR (thuc te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((tang xa) OR (tang ma)) hoi. hieu ve cac hoc va khanh dinh ((chuc tre) OR (thuc te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((tang xa) or (tang ma)) hoi. hieu ve cac hoc va khanh dinh ((chuc tre) OR (thuc te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((tang xa) or (tang ma)) hoi. hieu ve cac hoc va khanh dinh ((chuc tre) OR (thuc te))*.