Perhaps you should try some spelling variations:
sang thai » sang tai, sang than, dang thai
thai doi » thay doi, thai do, thai loi
cham duc » pham duc, cham soc, pham duy
ky sang » ky nang, ky dang, ky tang
hieu vu » hieu ve, dieu vu, hieu qua
han tai » hang tai, nhan tai, van tai
hieu va » lieu va, hieu qua
hieu su » hieu sau, tieu su, hieu so
tu sac » tu sach, tu cac, tu san
va han » va phan, van han, va hanh
sac ky » cac ky, sai ky
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang thai doi. ((((hieu vu) or (hieu va))) or (hieu su)) cham duc va han tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang thai doi. ((((hieu vu) OR (hieu va))) OR (hieu su)) cham duc va han tai cuc te.
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang thai doi. ((((hieu vu) or (hieu va))) or (hieu su)) cham duc va han tai cuc te*.