Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh tranh » canh tranh, hanh trinh, hanh trang
tong thong » thong thong, dong thong, cong thong
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh cua » doanh cua, manh cua
cua tong » cua cong, cua dong, cua nong
toan can » toan ban, toan cao, toan cau
tan can » tan van, ban can, tan ca
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 tranh cua tong thong ((((tan can) OR (tac can))) or (toan can)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh tranh cua tong thong ((((tan can) OR (tac can))) OR (toan can)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - hanh tranh cua tong thong ((((tan can) OR (tac can))) or (toan can)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh tranh cua tong thong ((((tan can) OR (tac can))) or (toan can)) cau*.