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
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
toan cau » toan cao, toan ban, toan tap
tac can » tac van, tac quan, tac vang

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 cua thong thong ((tac can) or (toan cau)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh trinh cua thong thong ((tac can) OR (toan cau)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh trinh cua thong thong ((tac can) or (toan cau)) cau*.