Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
hoc thien » hoc hien, hoc thieu, hoc thiet
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap
phan dau » phan tu, hang dau
va dung » van dung, va duong, vat dung

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 dung cong dan ((than cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh trinh va dung cong dan ((than cau) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh trinh va dung cong dan ((than cau) or (phan dau))*.