Perhaps you should try some spelling variations:
hieu voi » hieu moi, lieu voi, hieu loi
toc sach » hoc sach, doc sach, thuoc sach
tinh lap » trinh lap, tinh lao, dinh lap
sang tao » hang tai
voi pham » vi pham, toi pham, loai pham
va tinh » may tinh
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
cua tu » cua tuc, cua su, cua cu

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) OR (toc sach)) ky sang tao hoi. hieu voi pham duc va tinh lap ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky sang tao hoi. hieu voi pham duc va tinh lap ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky sang tao hoi. hieu voi pham duc va tinh lap ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky sang tao hoi. hieu voi pham duc va tinh lap ((cua te) or (cua tu))*.