Perhaps you should try some spelling variations:
chieu tach » chiet tach, chieu sach, chiu trach
trinh vet » trinh viet, trinh vat, trinh ven
luong tai » dung tai, luong va
ho chieu » theo chieu, hoc thieu, doi chieu
trinh ve » trinh he, trinh va, trinh vi
long tac » cong tac, dong tac, tuong tac
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tach - hanh ((trinh ve) or (trinh vet)) thang ((long tac) OR (luong tai)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tach - hanh ((trinh ve) OR (trinh vet)) thang ((long tac) OR (luong tai)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tach - hanh ((trinh ve) or (trinh vet)) thang ((long tac) OR (luong tai)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ho chieu tach - hanh ((trinh ve) or (trinh vet)) thang ((long tac) OR (luong tai)) toan tap*.