Perhaps you should try some spelling variations:
tinh khang » tinh khong, trinh khung, tinh thanh
hieu luat » hieu qua
bien soan » bien so
tin quan » trinh quan, lien quan, tong quan
van hieu » cao hieu
xuat vat » xuat va, xuat vac, thuat vat
vat bien » vat lieu, cam bien
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin quan luan van hieu luat ) or ( ((tinh khang) or (tinh quang)) xuat vat bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin quan luan van hieu luat ) OR ( ((tinh khang) OR (tinh quang)) xuat vat bien soan )).
• Adding a wildcard symbol may retrieve word variants: (( tin quan luan van hieu luat ) or ( ((tinh khang) or (tinh quang)) xuat vat bien soan ))*.