Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
hoc sac » hoc sach, hoc cac, hoc mac
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, xac va
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
cua te » cua tu

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 cam ((xuc va) OR (luc va)) hanh vi ((cua te) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang ma hoi. hieu ve cam ((xuc va) OR (luc va)) hanh vi ((cua te) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang ma hoi. hieu ve cam ((xuc va) OR (luc va)) hanh vi ((cua te) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang ma hoi. hieu ve cam ((xuc va) OR (luc va)) hanh vi ((cua te) or (ve triet))*.