Perhaps you should try some spelling variations:
thuoc sai » thuoc tai, thuoc san, thuoc sach
tao khoi » tao hoi, thao khoa, lao khoa
toc sai » toc san, toc dai, toc thai
tay hoi » tay ho, tao hoi, tay thai
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc gia » quoc gia
san cua » sang cua, ban cua, dan 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: ((toc sai) or (thuoc sai)) ky nang ((tao khoi) or (tay hoi)). hieu ve pham duc gia thanh san cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sai) OR (thuoc sai)) ky nang ((tao khoi) OR (tay hoi)). hieu ve pham duc gia thanh san cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sai) or (thuoc sai)) ky nang ((tao khoi) or (tay hoi)). hieu ve pham duc gia thanh san cua te*.