Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
nang mai » nang ma, nang tai, lang mai
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cam duc » cam xuc, cao duc, pham duc
hoc sac » hoc sach, hoc cac, hoc mac
hieu ve » hieu va
mai hoi » mai khoi, dai hoi, lai hoi
sac ky » cac ky, sai ky
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 mai hoi. ((hieu ve) OR (hieu van)) cam duc va danh vi ((cua te) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang mai hoi. ((hieu ve) OR (hieu van)) cam duc va danh vi ((cua te) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang mai hoi. ((hieu ve) OR (hieu van)) cam duc va danh vi ((cua te) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang mai hoi. ((hieu ve) OR (hieu van)) cam duc va danh vi ((cua te) or (va trien))*.