Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang cap
cham duc » pham duc, cham soc, phan duc
hanh tai » thanh tai, hang tai, han tai
pham duy » pham duc
duc tre » duoc tren, duc tien
va hanh » van hanh, va thanh, va danh
cai hoi » cau hoi, dai hoi, cai hoa
hieu va » lieu va, hieu qua
cuc tre » cua tre, cuu tre, cuc thue
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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 nang cai hoi. hieu va ((cham duc) or (pham duy)) va hanh tai ((cuc tre) or (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang cai hoi. hieu va ((cham duc) OR (pham duy)) va hanh tai ((cuc tre) OR (duc tre)).
• Adding a wildcard symbol may retrieve word variants: su sac ky nang cai hoi. hieu va ((cham duc) or (pham duy)) va hanh tai ((cuc tre) or (duc tre))*.