Perhaps you should try some spelling variations:
quoc doanh » quoc danh, quoc khanh, quoc toan
doanh khoa » toan khoa
sach truc » cach thuc, sach tren, sach thu
truc nuoc » truc thuoc, truoc cuoc, tru quoc
nuoc sach » nguoi sach, hoc sach, cuoc cach
tho thong » theo thong, pho thong, tao thong
sach tri » sach tai, sach tren, sach bai
tri quoc » tru quoc, tai quoc, thi quoc
tu sach » thu sach, su sach, te sach
khoa he » hoa he, khoa hoc, khong he
nha tho » nha thuoc, nha khoa, chau tho

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tri quoc doanh khoa he thong ) or ( tu sach truc nuoc sach nha tho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri quoc doanh khoa he thong ) OR ( tu sach truc nuoc sach nha tho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri quoc doanh khoa he thong ) or ( tu sach truc nuoc sach nha tho thong ))*.