Perhaps you should try some spelling variations:
nhung manh » nhung thanh, nhung van, nhung lang
hieu lang » chieu sang, hieu quang, nhieu tang
trinh mat » trinh may, trinh mau, trinh sat
trinh vat » trinh van, trinh luat, sinh vat
hung manh » hung anh, tung manh, duong manh
hoi hieu » hoi phieu, hoi tieu, moi hieu
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh ((trinh mat) OR (trinh vat)) thong ((hung manh) or (nhung manh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh ((trinh mat) OR (trinh vat)) thong ((hung manh) OR (nhung manh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh ((trinh mat) OR (trinh vat)) thong ((hung manh) or (nhung manh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh ((trinh mat) OR (trinh vat)) thong ((hung manh) or (nhung manh)) toan cao*.