Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
hoc sac » hoc sach, hoc cac, hoc mac
cau loc » hau loc, cau hoc, cau luc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sac ky nang ma hoi. hieu ve ((cau loc) or (cau truc)) va ((danh vi) or (dinh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang ma hoi. hieu ve ((cau loc) OR (cau truc)) va ((danh vi) OR (dinh vi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang ma hoi. hieu ve ((cau loc) or (cau truc)) va ((danh vi) or (dinh vi)) cau tren*.