Perhaps you should try some spelling variations:
khau thong » khau thuong, khau tong, khac thuong
phan xuong » phan cong
khap thong » phap thong, khac thuong, chap thuong
cach thuc » anh thuc, cac thu
manh khoa » anh khoa, xanh khoa, doanh khoa
sach tai » sach bai, sach tham, sach dao
tu manh » tu minh, tu hanh, vu manh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cach thuc) or (sach tai)) tu manh khoa ((phan xuong) or (((khau thong) OR (khap thong))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach thuc) OR (sach tai)) tu manh khoa ((phan xuong) OR (((khau thong) OR (khap thong))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cach thuc) or (sach tai)) tu manh khoa ((phan xuong) or (((khau thong) OR (khap thong))))*".