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