Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan ban, toan tap
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien hach - hanh ((trinh va) OR (trinh ve)) dung cong dan ((toan cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh ((trinh va) OR (trinh ve)) dung cong dan ((toan cau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - hanh ((trinh va) OR (trinh ve)) dung cong dan ((toan cau) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh ((trinh va) OR (trinh ve)) dung cong dan ((toan cau) or (phan cau))*.