Perhaps you should try some spelling variations:
khong quan » thong quan, hong quan, thong quang
tinh khong » tinh khang, tinh huong, benh khong
dung lam » dung luan, dung tai, dung dat
quan van » luan van, quan va, quan luan
van bien » van tien, van hien, vat bien
lam van » lam san, nam van, dam van
bien so » bien doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung lam van ((hieu luat) or (hieu qua)) ) or ( tinh khong quan van bien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung lam van ((hieu luat) OR (hieu qua)) ) OR ( tinh khong quan van bien so )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung lam van ((hieu luat) or (hieu qua)) ) or ( tinh khong quan van bien so ))*.