Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
ha thanh » va thanh, pham thanh, phan thanh
va triet » va thiet, va trien, ve triet
ca trung » cua trung, cac trung, cao trung
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
ha hanh » nha hanh, ha anh, va hanh
y nang » ky nang, ly nang, v nang
qua ca » qua cac, qua cua, qua cai
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: so sach y nang ma hoi. hieu qua ca trung ((ha hanh) OR (ha thanh)) vi ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoi. hieu qua ca trung ((ha hanh) OR (ha thanh)) vi ((va triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ma hoi. hieu qua ca trung ((ha hanh) OR (ha thanh)) vi ((va triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. hieu qua ca trung ((ha hanh) OR (ha thanh)) vi ((va triet) or (cua viet))*.