Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
cac hoc » cach hoc, cac hop, bac hoc
hoc ban » hoc bang, hoc dan, hoc bai
ca viet » va viet, co viet, hoa viet
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 y nang ma hoi. lieu va cac hoc ban thanh van ((cua vat) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. lieu va cac hoc ban thanh van ((cua vat) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. lieu va cac hoc ban thanh van ((cua vat) or (ca viet))*.