Perhaps you should try some spelling variations:
sang tao » hang tai
sang lap » sang ma, sang tai, dan lap
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
van cam » van nam, van lam, van cau
sach ky » sac ky, sach ty, sach kem
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
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: su ((sach ky) or (sach y)) ((sang lap) OR (sang tao)) hai. hieu van cam xuc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((sang lap) OR (sang tao)) hai. hieu van cam xuc va danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) ((sang lap) OR (sang tao)) hai. hieu van cam xuc va danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) ((sang lap) OR (sang tao)) hai. hieu van cam xuc va danh vi cua te*.