Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day manh » van manh, duc manh, ha manh
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
manh va » hanh va, anh va, minh va
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day manh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. ((hieu ve) OR (thien van)) nam thuc day manh va cau tren.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day manh va cau tren*.