Perhaps you should try some spelling variations:
thao khoa » thai khoa, toan khoa, pham khoa
thanh lap » thanh san, thanh hai, thanh van
tao khoi » tao hoi, lao khoa, tao boi
phan lap » phan dau
toc sac » toc sach, toc san, hoc sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
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 sac ky sang ((tao khoi) OR (thao khoa)). hieu ve pham duc va ((thanh lap) or (phan lap)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky sang ((tao khoi) OR (thao khoa)). hieu ve pham duc va ((thanh lap) OR (phan lap)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky sang ((tao khoi) OR (thao khoa)). hieu ve pham duc va ((thanh lap) or (phan lap)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc sac ky sang ((tao khoi) OR (thao khoa)). hieu ve pham duc va ((thanh lap) or (phan lap)) cua te*.