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