Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, hoa viet, cua vat
su sach » so sach
vu sach » vu khach
nang ma » tang ma, sang ma, nang cao
cac hoc » cach hoc, cac hop, bac hoc
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
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: ((su sach) or (((vu sach) OR (vu bach)))) y nang ma hoi. lieu va cac hoc va thanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((vu sach) OR (vu bach)))) y nang ma hoi. lieu va cac hoc va thanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((vu sach) OR (vu bach)))) y nang ma hoi. lieu va cac hoc va thanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((vu sach) OR (vu bach)))) y nang ma hoi. lieu va cac hoc va thanh vai cua viet*.