Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
trinh van » trinh han, trinh quan, trinh toan
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
toan cao » toan ban, toan tap
tinh va » tich va, trinh vat, tinh gia

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 - nhanh ((tinh va) or (trinh van)) hang ((cong manh) OR (cong danh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - nhanh ((tinh va) OR (trinh van)) hang ((cong manh) OR (cong danh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - nhanh ((tinh va) or (trinh van)) hang ((cong manh) OR (cong danh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - nhanh ((tinh va) or (trinh van)) hang ((cong manh) OR (cong danh)) toan cao*.