Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
tac giao » tac gia, tac giai, cac giao
hieu van » hieu va, thien van, lieu va
tac giam » tac gia, tac giai, tac pham
vu sach » vu bach, su sach, vu khach
cua suc » cua duc, cua tuc, cua cuc
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
nang so » nang som, nang co, nang ho
so hoc » co hoc, mo hoc, so hoa
cua su » qua su

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 ky nang so hoc. hieu van cam ((tac giao) or (tac giam)) thanh hai ((cua su) or (cua suc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang so hoc. hieu van cam ((tac giao) OR (tac giam)) thanh hai ((cua su) OR (cua suc)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang so hoc. hieu van cam ((tac giao) or (tac giam)) thanh hai ((cua su) or (cua suc))*.