Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua dieu
vu sach » vu bach, su sach, vu khach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu le » hieu ve, hieu he, hieu ly
hanh di » hanh vi, hanh de, hang di
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
va thu » va thuc, van thu, va tu
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang ma hoi. hieu le ((ma thu) or (va thu)) va hanh di ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ma hoi. hieu le ((ma thu) OR (va thu)) va hanh di ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ma hoi. hieu le ((ma thu) or (va thu)) va hanh di ((cua viet) or (cua vat))*.