Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tinh lap » trinh lap, tinh lao, dinh lap
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
tao hoi » tao khoi, tao boi, tay hoi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va tinh » may tinh
lap cua » lai cua, tap cua, lam cua
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: hoc sach ((ky sang) OR (ky dang)) tao hoi. hieu ve pham duc va tinh lap cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky sang) OR (ky dang)) tao hoi. hieu ve pham duc va tinh lap cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky sang) OR (ky dang)) tao hoi. hieu ve pham duc va tinh lap cua te*.