Perhaps you should try some spelling variations:
khoan thai » khoan phai, khoan tai, khoan thanh
thuoc sach » hoc sach, nuoc sach, thuat sach
hoach tri » hoach toi, hoach hoi, hoach thu
thai cong » tai cong, thi cong, thanh cong
dac khoa » da khoa, dai khoa, dau khoa
sach dao » lanh dao
tue dac » thue dat
khoa he » hoa he, khoa hoc, khong he
dao tuc » dao duc
tuc cac » tu cac, tich cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach tri tue dac khoa he thong ) or ( thuoc sach dao tuc cac khoan thai cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach tri tue dac khoa he thong ) OR ( thuoc sach dao tuc cac khoan thai cong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach tri tue dac khoa he thong ) or ( thuoc sach dao tuc cac khoan thai cong ))*.