Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
cac tu » cac thu, cach tu, cac du
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 sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cac tu va hanh vi ((cua te) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cac tu va hanh vi ((cua te) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cac tu va hanh vi ((cua te) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cac tu va hanh vi ((cua te) or (ve triet))*.