Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
khoa khau » khoa kham, khoa phau, khoa chau
lenh dao » lanh dao, benh dai, minh dao
cac khoa » cac khoan, cac khoi, dac khoa
dao tuc » dao duc
tuc cac » tu cac, tich cac
muc cac » duoc cac, luoc cac, muc chat
duc cac » duoc cac, dung cac, luoc cac
khoa he » hoa he, khoa hoc, khong he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu lenh dao tuc cac khoa khau thong ) or ( tu lenh dao ((muc cac) OR (duc cac)) khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu lenh dao tuc cac khoa khau thong ) OR ( tu lenh dao ((muc cac) OR (duc cac)) khoa he thong )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu lenh dao tuc cac khoa khau thong ) or ( tu lenh dao ((muc cac) OR (duc cac)) khoa he thong ))".
• Adding a wildcard symbol may retrieve word variants: (( tu lenh dao tuc cac khoa khau thong ) or ( tu lenh dao ((muc cac) OR (duc cac)) khoa he thong ))*.