Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
xay hanh » day nhanh, day thanh, xuan hanh
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, ma hoa, me hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc ((xay hanh) OR (xanh hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((ma hoi) OR (xa hoi)). hieu van nam thuc ((xay hanh) OR (xanh hanh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc ((xay hanh) OR (xanh hanh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc ((xay hanh) OR (xanh hanh)) vai cua te*.