Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thien hach » hien hanh
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, hang nong, bang cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
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) OR (thien thanh)) - nhanh ((tinh va) or (trinh van)) hang cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (thien thanh)) - nhanh ((tinh va) OR (trinh van)) hang cong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) OR (thien thanh)) - nhanh ((tinh va) or (trinh van)) hang cong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) OR (thien thanh)) - nhanh ((tinh va) or (trinh van)) hang cong manh toan cao*.