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