Perhaps you should try some spelling variations:
khoan phai » khong phai, khoa phau, khoan hoi
phai tuong » phan thuong, pham thuong, pham truong
truoc vang » truoc bang, truoc cang, truoc cong
vang khoa » hang khoa, van khoa, dang khoa
sach thu » sach thue, sach thieu, sach tham
thu sach » tu sach, thuat sach, thuoc sach
gi truoc » gian truoc, _ truoc
su sach » so sach, vu sach
tuc cac » tu cac, tich cac
sach gi » sach giao, sach bai, sach doi
khoa he » hoa he, khoa hoc, khong he
thong » trong

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 thu tuc cac khoan phai tuong ) or ( thu sach gi truoc vang khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thu tuc cac khoan phai tuong ) OR ( thu sach gi truoc vang khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach thu tuc cac khoan phai tuong ) or ( thu sach gi truoc vang khoa he thong ))*.