Perhaps you should try some spelling variations:
sang tai » hang tai, sang tao, tang tai
hanh vai » hanh vi, hanh va, hanh tai
sang mai » sang ma, lang mai, hoang mai
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
cuu tre » cua tre, cau tren, cau treo

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 mai) or (sang tai)) hoi. hieu va cac duc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((sang mai) OR (sang tai)) hoi. hieu va cac duc va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) ((sang mai) or (sang tai)) hoi. hieu va cac duc va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) ((sang mai) or (sang tai)) hoi. hieu va cac duc va hanh vai cuu tre*.