Perhaps you should try some spelling variations:
sang mai » sang ma, lang mai, hoang mai
hanh vai » hanh vi, hanh va, hanh tai
sang tai » hang tai, sang tao, tang tai
cuu tre » cua tre, cau tren, cau treo
vai cuu » vai cua
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
xuc va » tuc va, luc va, xac va
su sac » su sach, su cac, su xac

You may be able to get more results by adjusting your search query.

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