Perhaps you should try some spelling variations:
thien van » thi van
nang mai » nang ma, lang mai, nang cai
nang tai » hang tai, tang tai, sang tai
van pham » san pham, van phan, van phat
ve triet » va trien, su triet
hoc sac » hoc sach, hoc cac, hoc mac
va hanh » van hanh, va thanh, va danh
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) OR (nang tai)) hoi. thien van pham duc 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 mai) OR (nang tai)) hoi. thien van pham duc 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 mai) OR (nang tai)) hoi. thien van pham duc va hanh vi ((cua te) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky ((nang mai) OR (nang tai)) hoi. thien van pham duc va hanh vi ((cua te) or (ve triet))*.