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

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) or (hieu ly)) nam thuc ((va hanh) OR (va thanh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ma hoi. ((hieu le) OR (hieu ly)) nam thuc ((va hanh) OR (va thanh)) di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang ma hoi. ((hieu le) or (hieu ly)) nam thuc ((va hanh) OR (va thanh)) di cua viet".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ma hoi. ((hieu le) or (hieu ly)) nam thuc ((va hanh) OR (va thanh)) di cua viet*.