Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
cuc tre » cua tre, cuu tre, cuc thue
va hanh » van hanh, va thanh, va danh
duc tre » duoc tren, duc tien
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
te sac » te sach, te cac, te san

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

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